It was with gear, with which he's also familiar. My bad though for not saying, I sort of take it for granted that gear is in the mix when talking on PM

With GH alone, I wouldn't expect much but tendon health and bloat.
For Sammy, he went from 207 to 218. I agree though, I was gonna ask the same question about guys running high doses with little to show for it, but haven't got around to it yet/still researching. I have an idea why, I think it's overuse, too much for too long, used SQ, that causes somatostatin release and desensitization. (Jury's out on the last part).
For Mikey, Exactly Bro. It's why I began researching just such a protocol (not done yet). There's a bit more to it than just jumping into a high dose. I'd get off for a while before doing this 5 day protocol. My question for guys running good Rips at 15iu/ed would be; if they're running that much and not gaining keep-able muscle, why use GH at all, or why not change what they're doing? Nothing to lose. It's true and unfortunate that lots of people run lots of GH and get poor results.
I don't claim to be an authority AT ALL on GH, but different protocols do yield different results, even in my limited experience... GH is a just cascade initiator...it starts processes that run without help (more GH) for days. Overuse also causes somatostatin release that keeps GH from affecting certain tissues. And we all know about pulsing, different frequencies people use and amount to keep gains coming. Then there's IM vs. SQ. IM being superior for mimicking natural GH spikes.
A small example from personal use: I was using 2iu/ed for health purposes and for the reasons above, switched to 6iu E3D and got vastly better results. Better sleep, better fat loss when dieting and better gains with gear, whereas 2iu just made me feel generally better/healthier. 6iu E3D is the same amount per week, but with different/better results. More at once, sure. But you couldn't run Drol at a low/medium dose E3D and get anything good from it. IMO, GH just can't be treated like gear.
Check out Dat's page. As far as Peps and GH, there's no one more knowledgeable, IMO. I'll send a link to you about the above, Sammy. Check your PM's. Again, I'm no authority, just speaking from my experience and that of people I trust.