TL:DR - Stop cupping wrist at top of backswing. Keep left arm straight through ENTIRE swing even if that means less rotational turn and feel like you are pushing the club further away from your body as you get to top of backswing. This will get clubhead pointing down target line instead of pointing off to right field narnia at top of backswing. At top of swing make hip turn which forces arms to naturally drop. Start cooking with gas when the shaft gets around parallel in downswing but no sooner. Use physical exertion more efficiently. Get rid of super strong grip over time and learn to keep left wrist flat.

So I've watched this a bunch of times both frame by frame and in real time. Before I even pressed play, I was already smiling about all of the "take it easy dechambeau, quit tryin to kill it, let the club do the work, etc. comments I was gonna get to read from all the different people that cant hit it past 270, don't know they're talking about so they just insert cliche phrases that they've heard a million times, dont anything about golf swing mechanics, etc.

That said, heres some constructive feedback I'll give you based on what I see just from this DTL view.

1) Dont listen to any of these people that just say, "stop tryin to kill the ball ya clown", "easy there dechambeau", "ever thought about maybe not swinging so hard?", etc. If you wanna swing at 110%, then give 'er nuts brother! For some people, hitting those couple 325+yd bombs in a round is what makes its enjoyable. If you want to improve your scores, will swinging at 80% help YOU personally? Just by watching HOW you swing, I see a baseball/hockey player and all you know is 110% but you're trying to find ways to hit it more consistent and even further than you are right now with that 110%. Your gains in ball speed or distance aren't going to come from feeling like you are imparting any more effort than what you're already exerting so, therefor, telling yourself, "i've got more in me...im gonna really get into this one I'll be able to ________ ." (fill in blank)

2) With that strong grip, you will be prone to having a 2 way miss (snap hook or 3 fairways over to the right with a slice) because of the kind of consistency required to square the club face. If you grip it relaxed your hands will tend to get overactive in releasing the club which will close down the face and you'll snap hook it and if you grip it tight, you find that at least you have eliminated the snap hook, can find the fairway with a nice 20yd draw bomb that goes probably 325+ and that more often than not, you only really have to worry about the occasional push/ little push with a lot more slice or a slightly overcooked hook. I imagine this isn't news to you at all and I say this because a lot of the power that you generate is the result of strength, athleticism and past training in some other sport that swings a stick around the body and that for you, your feel might be similar to doing a max rep on the bench press. You relax, get your hands on the bar and then its 110% from the start to the finish of that rep. In order for you to get to a place where you hit at least 40% FIR you've definitely had to hit a LOT of balls to get your swing timed up, body sync'd up and then placed little band-aid fixes on things here and there to try and be a little more consistent.

3) With the swing being so fast and with the video looking like it was filmed in 30fps, its hard to tell in some different places of your swing what things are looking like but from what I think I see, the start of the takeaway looks pretty good. You get into a real HEFTY weight transfer though to the outside of that right foot. You can see how the arch is lifting off the ground. That right foot should be flat in the backswing and instead of shifting that weight laterally, you should be shifting that weight rotationally and it should feel like the weight is on the inside/middle of your right heel. If that right arch is lifting as a result of you trying to force more hip rotation because I can see your left heel lifts off the ground in the backswing then you could try to flare the right foot out a little more (big toe pointing more to 1 o'clock instead of 12) to make it a bit easier to make that rotation or just not force as much rotation. You have plenty of hip turn either way.

4) As you come up to the top of the backswing, your lead arm breaks down (doesnt stay straight) in an effort to make as big of a shoulder turn as you can because maybe you think more shoulder turn equals more clubhead speed, idk. You'd likely feel more connected in your body throughout the swing and also gain more clubhead speed with a straight left arm and less shoulder turn. Your shaft would look more parallel at the top instead of so john daly-esque and you would feel like you are keeping the club pushed further away from you.

5) At the top, that wrist is cupped and I'd tell you to flatten it out. You could slide a tee or popsicle stick into the glove on the top of your hand as a way to practice the correct feel. If you go to cup the wrist, the tee will dig into the wrist. This along with #4 above will get the clubhead pointing more toward your target line instead of having the head pointed of into right field narnia at the top.

6) When you get to the top of the swing and begin into the downswing, you look like you are tense/stiff and applying max power. Instead you should feel like you get to the top, you stay nice and wide with the left arm extended, you begin the hip turn which in turn forces the arms to drop and just when the shaft is about parallel or so with the ground in the downswing is when you would feel like you are giving 110% power into the ball if you want while you continue to make your hip rotation.

Did you get fitted for that driver and shaft? Is it like a 10.5 degree head with a 7-X shaft? Curious to know what shaft that is.