I'm not sure what to do about form. I don't have use the big powerlifting arch, but I tuck my shoulders, and I think I stay pretty tight in my upper back--Two months ago, I actually strained a trap benching. Should I work on benching with a big arch? It's really hard for me to start in the right position on heavy lifts, because I pretty much have to unrack the weight by myself. Also, when I try to move my feet back and maintain a big arch, I tend to bridge when I'm straining to finish a rep. I hate missing PRs because of this.