Hey! Are you working on a category? Zipless, perhaps? Check out this movie to see my attempt at doing this stage Buster-only.
There are a few things I can point out:
You can actually press start on frame 149. The stage select/pass word menu won't appear at all, and you'll go straight to the actual stage select screen with the wrong music.
Tiptoeing is bad. Do a 1-frame jump when you need to move from a standstill.
Jumping is slower, for some ungodly reason. Try to stay on the ground as much as possible. You can see your X position at 0x0460 (pixel) and 0x0480 (subpixel), and your X velocity at 0x0600 (pixel) and 0x0620 (subpixel).
The cloud riding section is not an autoscroller. Jump off the edge of each platform to spawn the next one a bit sooner.
During a screen transition, there's no need to wait until you reach the ground to start moving. The game listens to inputs as soon as the enemies appear!
Also, don't get fooled by the clouds. Make sure you're moving even when you can't be seen.
Your first air tiki (big pink guy) section is really good. Try to do the second group of them the same way, i.e. without stopping.
You turbo shoot the enemies, which can sometimes cause shots to be harmlessly absorbed. The fat fan guys only take 5 shots, for instance. You can find enemy HP at 0x06D0 - 0x06DF in memory. Boss health is at 0x06C1.
Definitely give the any% Air fight a watch. You can start jumping and shooting sooner than you do.
That's all. I know it's a lot, so let me know if you have any questions. It's always good to see a new person getting into Rockman 2!