I also saw quite a few posts about 5/3/1, so I'll look into that and see if and when it's appropriate for me to switch.
I've decided to forgo that sprinting for now. It weird what a difference a week will make. A week ago, when I started this thread, I felt perfectly capable of sprinting. Between now and then, my 5x5 squat has gone from 185lbs to 200lbs, and I can say with certainty that if I tried to sprint now, I would feel some serious pain. Perhaps I'm closing in on a 5x5 stall soon.