Yeah got to 80kg for 20 reps on squats.
The back seems ok so far.
This is probably my last attempt with squats.
If I get one more back injury I will stick with leg press and start progessively overloading lunges instead of squats. In many respects heavy walking lunges are just as good and in some ways better than squats, especially for someone that is concerned with back injuries.
I reckon 80kg walking lunges would be a decent first goal to shoot for.