Fixed lol. Diet is obv very important, but I couldn't resist. You're doing too much volume before a true PR attempt - you can do additional work after the PR is set, but leading up to it is simply minimal volume to prime the nervous system. Cut the 275 & 315 to 3 reps each & drop the 365 & 385 singles in place of a 375 - 30lbs isn't too big a percentage jump here. We just cut 4 moderately heavy reps & a heavy single out before your max attempt while actually keeping you warmer since you'll get to the PR several minutes sooner by dropping a set. I know you bench 85 more lbs than me lol, but I've found this to be key if I want a chance of setting a PR on any lift - absolute minimum volume before an attempt, besides like barweight warmups at the very start. Deadlift is especially sensitive - it already takes like 30 min to get to a PR attempt on dead, no joke. Deads are seriously 8 min rest before a true max - 8 min is 98% ATP recovery, which is as good as you're gonna get. 4 min 30 sec is 95-6%, which is why you hear 5 min rest before a max attempt so often.