MGF is unrelated to GHRP's and GHRH's. GHRP is going to be more effective on it's own, compared to the GHRH's.. but I still recommend that you pair them together. Some research subjects to experience sleep disturbances from the GHRP-2. This is due to an increase in cortisol levels. There is no guarentee that this will happen in your research, but it is a very real possibility.
Use the MGF 10-15 minutes post workout. Natty MGF levels will peak, as you are introducing the exogenous MGF. Wait 15-20 minutes and admister GHRP/GHRH combo.