Im really scratching my head on this one, and looking through as many threads as I could, I couldnt find any similar issues where only the start is the issue. I just swapped a LS3 crate engine in (brand new from GM), and mods listed below. It ran decent on the old engine with the same mods, but would have warm restart issues at times, just never start issues, where now the start is the problem, but I can immediately restart it just fine.
2009 Escalade ESV
LS3 crate engine
Whipple supercharger with their map sensor
Flowtech Stealth LS3 cam
ARH Long tubes with cats, custom true duals
Circle D 2400 stall 300mm converter
Brand new battery
Log and latest tune attached
I have tried increasing and decreasing starting airflow, starting fueling, starting timing etc. I have been driving it all day and I would say the starting is getting "better" in that when I Started the day with the tune from my old engine. When I started tweaking, id have to use some pedal to get it going, or put the pedal to the floor, so I thought I was making progress, but nothing I do seems to make it better, and when I add a lot of air, the starting actually gets worse. It idles fantastic, trims are all good, I Did all the VVE tuning this morning, I just did some WOT pulls and they were clean as could be, but nothing I do will get it to start up EXCEPT if I start it, turn it off, then immediately restart, for the first 30 seconds or so it fires right up, but much beyond that, its back to crap. Im running 850cc injectors and have their values put in, and stock flex fuel pump. I thought maybe the pumps are going, but I can cycle the ignition a few times and it doesnt fix it, and the soft lines are still nice and firm with fuel pressure. I dont know a ton about the newer pumps, but id imagine they prime just the same as the old stuff, but if im wrong, I guess I need to buy some pumps. I did see a voltage drop on some of the starts, so I tried starting both with a charger attached, then I replaced the battery since it was in the car over a year ago when I bought it, nothing changed though.