Just wanted to recommend this free program from Stronger by Science if you're looking for a powerlifting based program. It's a little wonky, the 28 "programs" are basically modules for the press (bench or overhead), deadlift and squat divided up by frequency, intensity and/or volume. You then combine them together for a program.

I have an incredibly hard time building upper body strength and size. My legs have always been good to me, I hit a 440 lbs squat during this for example. But I have never seen my arms peak above 16 inches around until after two months on this program where I went from about 15.75 to about 16.25 inches or so.

My legs also blew up over 27 inches around now, and that's fine and all. But it's summer. Suns out, guns out and all that.

Just wanted to pass it on if anyone is looking to for a change up in their lifting.