Thus far I have only used GH with AAS, except for using GH post cycle for one month. I'm just finishing "building the Perfect Beast" and I highly reccomend it for any advanced gear users. I, like many, had gootten into the habit of doing some rather lengthy cycles. In BTPB the author suggests "phase cycling," in a nutshell doing one month of AAS and one month off, with non-AAS growth factors, like IGF1, GH, PGF2a. THere is alot more to it than that summary I've given, but in the off month, a good anabloic non-AAS cycle would be GH/insulin/T3. In your case, two months at a time, I would not personally not use insulin for more thant one month. (I want to get fucking freaky, but I don't want to be a diabetic when I get there!) The idea is maximum muscle mass gain over time, as you've pointed out. I've always said, "Anyone can get big on anabolic steroids. The trick is to keep the gains, and then get bigger still." That is the intent of phase cycling.