I wouldn't worry about gaining your weight back after stopping GH use, IF your diet is in-check.
I just came off a 6-month GH run a couple months ago, and I have noticed no negative effect, and have not put on one ounce of fat, in fact I have even lost more. Of course I picked up Primo mid-GH cycle, and just ended that one as well, also my diet is on-point, so those are all factors in my current state of ripped-ness. Basically if you live like a slob, you will look like a slob, doesn't matter what drugs you pump into yourself. Though I will say this, I could eat like a horse on GH, and it all went in the right places, and I was STILL losing fat. True story.
As far as your natural GH being shut-down, if you run your GH properly (EOD, or 5 days on, 2 days off) then GH shutdown should not be a problem. It certainly hasn't been for me. Also, I know guys that run 10 iu's/day or even more, and they haven't got any shut-down of normal GH either, usually it takes a week or two to bounce back to normal once you come off of it, and that's it. If you're worried about it, get your hormone levels checked bro.
Damn, this thread is getting me horny to start another GH cycle.