Having the bottom kick out seems to be pretty common with single cam and some hybrid cams. I put the PSE NV system on my mighty might and it got rid of it. I don't see where it really matters though.

Look at the video again and see when these things are happening. If it is after the shot don't worry about it. The arrow is already gone and they are not effecting anything. If you shoot with the proper loose grip and have good follow thru it is ok to let the bow do what ever it wants after the shot. If you had to look at video to notice it I am guessing it is a non issue.

When things get bad is when you try to compensate for things and subconciously try to correct them before the shot. This is why a suprise release is so good. If you don't know when the shot is going to go off you can't mess it up before the shot. However back tension releases don't work really well for hunting, so you have to practice good follow thru.

I would suggest going with a hip or backpack type quiver if you can. If not I wouldn't worry about it too much. The important thing is do your arrows go where they are supposed to? If so I don't see where you have a problem. Quit doubting your equipment and practice more concentrating on having the best form and release you can.

Good luck,
Paul