GHRP-2 sounds really interesting. I have only used GHRP-6, mainly for the increase in appetite. I ran it once with CJC-1295 + DAC (I know this causes GH bleed) and that was really good. Numbness in the hands and noticable fat loss. Still too expensive for me for the subtle results it gives. The cortisol and prolactin spikes also worry me.
I have used (peg) MGF along with IGF-1 a couple of months before a cycle. From undergrad cell bio, for muscle hypertrophy you need myoblasts to become activated, differentiate and fuse with damaged myotubes. This will use up existing myoblasts so you also need a way to make them go into the cell division cycle via a growth or mitotic factor.
IGF-1 would be the protein that causes the myoblasts to become activated after cell injury and differentiate into myotubes and MGF (and IGF-1 to some extent) should cause them to divide replenishing the pool. You shouldn't use both at the same time because one action (activation for example) will block the other (mitosis).
I remember using IGF-1 (50 to 100mcg) 3x a week post workout IM'ed and peg-MGF 2x a week sub-q @ 250mcg (I think) for 5 weeks. It may have been too much though (receptor downregulation).
I have also run IGF-1 solo a couple of times (once during pct) and comparing the results, I really don't think the MGF helped at all. Gains were very subtle in all cases, definitely good pumps and fat loss but not much pronounced (immediate) muscle growth. So, I didn't really see much noticable benifit from adding MGF to my IGF-1 protocol. Maybe the dosage or timing wasn't right or more likely the results are just too minimal to notice.
or weird about it, it's something has been done for a very long time, you just hear more about it now due to today's technology, i.e. the Internet