That's weird PK, I always did low volume last year. And I could probably do 315 for 5 reps tops. And my PR was 355 (just chalk). Maybe it's a mental thing? Get a friend to slap you in the face - attempting a new PR on a deadlift or bench is always a slight fear of mine. Bench - I'd have to slide off the weights if I fail and Deadlift - form is insanely critical as you know already.
Are you using chalk for your PR?
On a side note, after a wicked session, overate when I should be on a deficit
