Hog,
I can't feel any difference in recoil between the 22" and the 18" barrels. My GG is ported so there is less muzzle flip with my 18". As far as bullet weights go, it depends on how fast you push them. A factory 405g load is not at all uncomfortable to shoot. On the other hand, you can push a 300g or 350g bullet to the point of not being any fun, at all, to shoot.
I would suggest a recoil pad replacement. I used a Decelerator, and it made a lot of difference in the comfort level of the gun.
I load mine for the best accuracy which is somewhat less than max.
I have owned all three, 18", 22" and the 26"CB. I have only one now, the 18" GG. It fits my needs better than the others.
Best,
TnNuc