Need more pressure

I have been pumping for about a year and a half, at 5 to 7 in HG, with a two inch cylinder. I recently purchased a one and three quarter inch cylinder, hoping to kick start my length gains. The thing is , with the new cylinder I need to pump up to about 10 in HG, to achieve the same stretch as with the larger cylinder. Has anybody else experienced this?

I’ve been at this for a while and I really don’t think for sure that length comes after packing the tube. With that kind of vacuum, you’ll get major blisters that will take months to head. You need to stick with the 2” tube to even out the vacuum. A little non-pack on the side is OK. Keep the vacuum low.

I regularly pump at 10hg up to 90 minutes (straight) it’s all about conditioning.

I would recommend amateurs stick to under 7 however.

I think you were getting a false stretch in the larger tube. I think more of your “fat pad” was being sucked in and giving the perception of a better stretch.