After 12 weeks of 5/3/1 I got some pretty decent progress on all lifts. Basically my old 1RM became my new 6-10 RM. Last Saturday I took my old ~5RM squat and did 3 sets of 10 with it. Paid the price after that in terms of soreness but it was worth it
I like that I was able to 'figure out' my deadlift and squat form, and I no longer have to worry about hurting my hips or back any more. For deadlifts I did deficit deadlifts for all my early sets, then regular for the main working set. I feel that helped quite a bit.
But I find power lifting to be incredibly boring and not immediately rewarding. I have to admit, ever since I started TRT and am now actually able to get a pump, it's what I care about most when I lift. The pump you get after stretching and burning with bodybuilding style sets feels SO GOOD and you can feel yourself get bigger each week. Maybe not stronger relatively, but tighter and fuller and veiny.
So I'll be sticking to bodybuilding, back on my 4 day split. Weights are way up since the 12 weeks of 531, so I should be able to get an even better pump than before.
Plan is to do about 16 weeks of this, then cut for 12 weeks and go from there.