I not not start clamping until about the 3rd month when the gains seemed to taper off.
As for the jelqs, in the beginning I tried to jelqed every other day. After several weeks of this, I was having some negative indicators, soreness and lack of morning wood. I stopped the jelqs until the soreness left and the morning wood returned. I then begin to jelqed twice a week and that seemed to be about all my penis could handle. I did increase the amount of time and number over time.
I believe everyone has their own tolerance and you just have to find it by trial and error and don’t overdue.