So, let's refocus on the wants, which is girth, and the needs, which the proper routines.
We can't be in the pump for 20 to 40 minutes and expect to gain. The only you will get a gain of is a very high level edema.
In girth, you have to use the positive pressure to force the tissues to stress, which is the jelqs (SSJ, horse, titan, DLD Basters, etc.). The negative pressure takes advantage of the stressed tissues by forcing more blood in. You have to do the back and forth to get gains, from positive to negative, and negative back to positive. If we just stick our penises in the pump under pressures and we can all gain like it's a normal walk in the park, we all have massive girths by now.
Let's revise your workout routine availability of time for consistent application of the girth exercises. Can't be wanting girth and not put into the proper time and workout routine.