Good points for compressed high ready, but after practice I prefer low ready. I will practice the compressed high ready again based on MJ's comments. However, my experience is that the same issues with low ready affect compressed high ready. The difference is that compressed high ready put more of my body in jeopardy when contacted by attacker. Low ready exposed less of my vital areas to my own gun if surprised by the bad guy.
I find the forum difficult to go into all areas concerning issues, but it is good for small exchanges.
My two main points based on your initial comment is to stay away from the "movie style" with the muzzle up, and stay away from hearing protection. Beyond that, gather all the information you can, take classes, practice, practice, practice, and stay open to instruction.