You are a college age kid delaware. If you are not getting enough pressure with 2 clamps, either you have negative PI’s from overtraining and need to give it a few days off, or your clamping technique needs work. As you used to get good results from clamping, it’s probably the former.
You suggest in your other current thread that you are not feeling enough intensity from manual exercises. PE is far more about time and patience than damaging your dick trying to create massive pressures and intensities. Most of the time, trying to get intense feelings of expansion/stretch etc. will just condition your dick to the point where nothing is going to work for you, or give you any feelings at all. It’s also a fast route to ED and injury.
Take 6 weeks off then start gently with the newbie routine again. Build it up very, very slowly and stop worrying about how much intensity you can feel. Keep consistent and in a year you should have a bigger, healthier dick. In two years it should still be improving.
If you constantly chase maximum intensity, you will get no growth and probably erectile dysfunction.