Having issues with using Penimaster Pro extender

I am about 10 hours in Penimaster Pro, but it is really uncomfortable after about 1 hour of usage.

There are several issues I’m facing:

1) The plastic base of extender that holds against pubic area hurts the skin at base of the shaft. Is there a way to put something around the plastic O ring to have it push softer against a skin and not irritate it?

2) I’m uncut with rather long forskin, so I have to pull it back before sucking the glans in the chamber. Still sometimes foreskin goes inside as well and when it comes out it is often puffy and sensitive, very uncomfortable. I have to wait for the puffiness to go down.

3) Pulling glans out of chamber always hurts. I apply the sticky lubricant that came with Penimaster package, but it still hurts even when I pull out really slowly.

I know that this extender is most likely to add to my length, which is what I need, but I can barely wear it for 4 hours (2x a day for 2 hrs) and it is always very uncomfortable to take it off.

Any tips to fix these issues?