hGH is NOT an anabolic so "keeping gains" is going to be more related to the quality of your cycle that gave you those "gains" (e.g. if highly estrogenic - lots of water, short cycle, you might just be bloating up and then shrinking as soon as you come off), what you took and how well your diet & training continue to support those results. Really doesn't have much to do w/ GH. I'm also wondering why you're associating GH w/ starting your PCT? Never heard of that before. What's the logic behind it?