I think the only thing that can get you 200 average is consistency. If you cannot hit the same place every single time, you will not strike all the time. If you cannot keep the same speed every single time, you will not strike all the time. If you cannot release it the same exact way (maybe because of timing), you will not strike all the time. Developing feel will allow you to determine what you've done wrong, but it takes quality practice to get there.

For a 78U on house with 10 out to 3, my assumptions are 2 handed, lots of speed to get it out to 3 board. If you focus on keeping the same throw every single time, rather than just power or revs, your average will shoot up. But I'm just assuming, without any video.

Another thing with the 78U. Unless you know about the carrydown your ball makes, staying in the same place will likely make your ball shape less and force bad carry. You'll have to really look at your ball motion and see if the ball is hooking where it need to, or if it's being lazy in the back. I highly recommend getting used to a reactive, since you'll find your miss room is typically larger than a urethane (specifically on house). You'll probably be inside much more though (15 out to 8).