Somebody clarify the correct way to do the side-float drill

I've recently improved my swimming thanks to Mr. Pull Buoy, and I'm revisiting a drill that was really responsible for a huge over-rotation (and slowdown) in my stroke - the side float drill with arm out front, that's supposed to improve body position in the water and set you up for a good breath.

My body position now is pretty good, and my stroke is a lot better, but as I revisit this drill, I don't think I'm doing it right. It feels as if I'm over-rotated in the float position, and when I roll a bit more to get a breath, I'm definitely too far rolled compared to my normal stroke, but I can't seem to settle into a decent position in the water in the drill. I don't have problems breathing now while swimming normally though (though that took 6 weeks of heavy pull buoy work.) 

It is entirely likely that I'm going too slow with my nearly nonexistent kick for this drill to be that useful, and that fins are necessary for it. 

Is there a good youtube video or key angle of rotation that you're supposed to be in to not be overdoing it? The way that Total immersion describes this float drill it pretty much sets you up for a HUGE over-rotation, in my opinion (that's how I learned to swim, and I spent 6 weeks undoing it.)