Hey guys, I have the same exact pump and it happens the same to me, when I’m already erect it’s easy to pump and to reach 110% of my max erect length. The problem is when I’m flaccid when I have to do a small pump to make the penis get up to 50% erect which takes like 1 or 2 minutes.
After that I start my session, one thing that helps when you are flaccid is using a condom at 50% so this way the penis slides inside the cylinder easier and I can reach 110% fast. Also you can re use the same condom a few times.
Now for the post session issue, it’s also the same here, when I’m done it’s about 60-70% erect and 10-20% thicker, that’s when I start jelqing.