PEG- MGF, I would mix in same syringe with IGF1-LR3 and insulin, and inject I/M immediately PWO.
MGF does not compete with IGF1 for the same receptors, so it can be injected same time with IGF1 and best time to inject MGF post workout, b/c at this time our muscles naturally producing MGF.
There is not much relations between GH and MGF. My point of injecting GH 2 hours later is based on fact that GH action on muscle mainly mediated via IGF, and difference between IGF1-LR and own body IGF is that IGF1 LR3 will go directly to receptor and it cannot bind to any thing else, so it is gone from circulation in 10-20 minutes. Own body IGF1 will bind to IGF binding protein (mainly IGFBP3) and that way will remain in circulation for 24 hours minimum. That is called basal body IGF, and even after single 1 IU GH injection basal body IGF will rise significantly.
In case of use of IGF1 LR3 PWO it is really not so important when to inject GH, b/c PWO need in IGF1 already covered.
But injecting GH after insulin make sense because insulin will stimulate release of endogenous GH and this GH will naturally bind to GHBP and SOCS 2 and when we will inject GH 2 hours later, amount of these negative GH regulators will be less.