I looked at that last 5 min test video you posted. It looks very solid. I don't really see anything obvious that doesn't look good. How does it FEEL? Are there any areas that feel off, even if they might look okay? Are there any areas that seem to consistently separate a great rep from one that feels a little off (even if an outside observer might not be able to tell the difference)?
I mentioned above the technique of leaning back against the bell on the drop, which helps keep the center of mass from getting too far in front and enables you to start absorbing the force of the drop earlier. It makes the drop less "floppy" and the catch at the bottom less abrupt (less like dropping a weight tied to a rope and having it free fall until the rope abruptly snaps taught). It's a lot like when you swing a heavy bell and end up inclined backward at the top (inclined, not hyperextended), except in the snatch you start the drop from a static vertical lockout and then have to transition to leaning back on the drop a little more consciously and deliberately.
It looks like you mostly do this pretty effectively, although I did notice that at times when you got fatigued you got caught casting the bell a little too far out in front, with that floppy "slack fall and abrupt stop" kind of drop (most noticeable on your right arm in the last rep or two before you put the bell down for a break near the end).
On another note, have you done much or any continuous or high rep per set training lately? Having spent the summer myself doing 5 reps per set training with aerobic recovery, I think that although this is great training in general, great base training for continuous snatching and obviously has a lot of carry over (as seen in your substantial 5 min test improvement), there is still a gap in specificity there.
