I've decided i like high bar squats more...at least until i get injured and move back to low bar again

and the higher reps are going well. Im not sure of the protocol for 20 rep squats. Is it just supposed to be one set or not, how much rest etc. I've just gone for 3 sets, and im needing 5minutes between sets because im so tired and out of breath anything less would be impossible.
Got a press PB today.
42.5 3x3 Then failed the 2nd rep in the 4th set so did a back off set of 10. Im worried im using too much knee on these too but i cant say for sure unless i film them to check.
I also tried Yates Row for a few weeks. I liked them at first but then my low back started hurting right after the sets and after the workout, so i've ditched them now and gone back to dumbbell rows for higher reps.
Lastly, the change in squats and wider grip for bench caused pretty bad doms. My glutes were still sore going into todays squats and my chest is still a little sore from bench. And everyone knows you grow when you get sore, so obviously im delighted.