I train Brazilian Jiu-Jitsu pretty seriously (about 6 days per week) and have been doing the MMA variation of 5/3/1 to improve my strength, http://www.jimwendler.com/2012/02/531-and-mma/ sometimes splitting it into 3 days depending on my training schedule. It has been going well for a couple of months now, but my progress is really slowing down. Where I used to get at least 2 or 3 reps above the minimum, now I am basically always getting the minimum, and struggling to do so.
On a recent squat I actually got 1 less than the minimum, though my lower back was still sore. I have been running it on 3 week cycles with no deload, since the program doesn’t mention doing a deload. As context I am 5’11, 180 (I compete at 170 or 175, so gaining weight is not an option) and my max lifts are
Squat:240x1 (I know this sucks, it is really hard to balance squatting and training)
Any suggestions on how to keep my progress going? Would adding more assistance work help? Right now I mostly do dips, kroc or cable rows, various chins, face pulls, and single leg squats. Is deloading necessary when I only lift 2x/week?