I had a problem with floating as well, until I called Trophy Ridge. They send me (overnight) replacement alan head screws that I was able to tighten. No more floating! I broke off my plastic 20 & 30 yard pins last year tracking a buck through the brush. I bought the steel pin replacement kit from Trophy ridge and haven' t had any problems since!
This was a Brand new sight when I got it, and didn' t have too much of problem having to treak it a little. I' ve got all the bugs worked out of it now and I love the sight!