If you ever get an injury that prevents you from sprinting but not squatting you will probably find that your squat suddenly shoots up to previous levels or even higher. I recently experienced this during a layoff from sprinting caused by an achilles problem. Within weeks of no sprinting, my squat got better than it had previously been after more than one year of pure powerlifting training. I put it down to CNS fatique caused by the sprint training, which is particularly evident if you lift after your high intensity sessions.
BTW: How do you do your squats? There seems to be a huge discrepency between your squat and bench PBs.