I have recently switched program to 531 from having tried various other programs in the past. I started with doing two cycles of 5s Pro with BBB and will now soon finish my anchor that consists of “normal” 531 with FSL. I have done both main lift and supplements on the same day.
Overall I am happy with the strength increases in all lifts except squats. My squat has remained the same and perhaps even regressed a little bit. I have gained weight during each cycle, so that should not be the problem. Also, since all lifts but the squat have gone up, it feels like there is something off with the programming for the squat in particular.
For my next leader cycles I am considering continuing with classic 531 + FSL for all lifts but the squat, as that seems to be working quite well for everything else. My question now is what to do with my squat training. I have previously had some success when my squat training has consisted of squats 5x5 sets at about 80% of RM one day, and then 3x8-10 Front Squats on another day (increasing the weight each week). So one option I see is to try SSL for squats and keep everything else the same in order to get more heavy sets in. Another option I am consider is simply doing the supplemental lifts on my DL day (and the DL supplement on my squat day) to increase frequency. I guess it is best to only change one thing at the time to see what can solve the problem.
I would be very grateful if anyone of you have any input on what you guys think I should change first in order to get my squat back on track.