Your best results will be to go in fully erect, and kegel into it. With a light compression on gator I begin to kegel and the vacuum power sucks my penis huge right away. Lil pump, kegel to push out more water... and I'm about +1" in girth and length expanded pretty quick bro. Now, this took me s months conditioning and experience how to pump properly with no air in. By my 3rd set my girth is maybe +2" and wants to fill that tube. Wow.
Extreme you can use the ball pump instead of squashing the unit against your fatpad. You can probably suck air bubbles right out by aiming the tube Up as you pump the ball. I'd still suggest kegeling to push blood into penis as you pump tho.
Follow the link to learn more about: Girth program (SRT 5x5x3).