Jax, I can appreciate how far you *have* come, after going through my SM class this weekend...
My instructor kept us at no more than 100psi difference per bottle (I read an older debate on here about this, and even diving HP100's, I could definitely feel the list to one side if I got beyond 300psi difference). Additionally, even though the Hollis is a donut, you can apparently still trap a bubble on one side or the other (unintentionally, in my case).
I know I improved over the course of all the dives and drills (which is relative, since I tied myself in a knot a couple of times, 'til I took heed to what my instructor was patiently pointing out). But, by the end of two solid days in the water, I was at least able to somewhat resemble an in-control SM diver... Now, just have to practice everything I've learned for a few dozen dives, before I'll feel comfortable *calling* myself a sidemount diver...
Thanks to everyone's contributions in this thread... amazingly relevant and helpful... and Jax, thanks for the videos... your buoyancy control in 8' of water is admirable. (I couldn't stay that motionless 'til approx. 30 feet down).