Insulin With IGF, Timing?

If using both insulin and igf, when would be optimal times to inject?

BACKGROUND, I am a type 1 diabetic, meaning evertime I eat I inject insulin (nolvalog) and problem is, I eat a good size pre workout meal, as well as post, so there is almost always a high level of circulating insulin in my body around workouts.

I have heard insulin can HELP with IGF response, BUT also heard if there in the blood at the same time, the INSULIN will over power the IGF and make it useless?

Opinions?