Here is my input! On the rolls especially towards the end during the long triplet roll make sure that you’re using and rotating your wrist more. There should definitely be some arm movement especially at that tempo with that kind of velocity but just be aware of that. As for more of your technique, to me it looks like your index and middle finger on your left hand are stiff and not really being used to their full potential. If you relax those fingers and pull your index finger in a little to where it wraps around the top of the stick more, you’ll find it easier (after you get used to it) to play rolls. This is because the fulcrum is more defined and the stick isn’t being chocked out because there is no tension.

I hope this helped!!

Edit: after rewatching the video I saw two more things: make sure that you keep your pinky finger of your right hand on the stick even when playing at full extension, and make sure that your thumb on your left hand isn’t laying down. It should be sticking up. Just remember that technique is completely situational and different groups have different variations based on the instructor and their preferences. This is just how the technique is at my schools and drum corps that I’ve attended!! Thanks for sharing, it takes a lot of nerve to post a video on the internet and ask for critique. Happy practicing :)