Couple Duramax Log Questions

[427lightning]

I'm helping a buddy try to diagnosis what seems to be an intermittent fuel miss. Looking at the flow rates at idle, the lowest is -2.72 and the highest reads 2.63. Is that a sign that he has injectors going out? Also, when logging a couple full throttle passes to see what it was doing, there doesn't seem like much difference between his Edge Juice w/attitude on 5 vs stock with the Edge totally unplugged from the system. Is that normal cuz the Edge fools the computer to the point where the EFI Live logging tool doesn't see it? Sorry about all the questions but this is the first Duramax I've hooked to and stuff is a lot different than the Cummins stuff.

Any help is greatly appreciated.
Thanks