Don't do much assistance. Just hammer the big lifts. Do your sets and reps of 531 then hit a single at 85% and 92.5% of what your goal at the meet is.
At the meet you should have an opener 85% of your goal, second attempt 92,5% and final attempt obviously 100%
I would run through one last cycle of 531 then spend a couple weeks deloading, and eating until I make myself sick. Have some faith, and some fun. Good luck.