VT V6 Ecotec Rich mixture Help!

Hi all, although relative to all tuning platforms, TunerPro RT terminology is a bit different so any advice would be great!

I'm using a VT V6 N/A Enhanced bin file in the Delco ECU, Service # 16233396 from pcmhacking.net. (VS Engine with correctly chosen injectors for the VT model at a base rate of 361.33 msec/gram [green/turquoise ones]). This is installed standalone, vats off, lean cruise off, manual trans flag set (700r4 mechanical Auto).

I have just installed the NV SRAM Board (also pcmhacking.net) for realtime tuning and logging as well as the LM2 for some AFR logging.

My situation is - Idle AFR's are set to 14.6 at most temps, but I'm getting anywhere between 12.2 and 12.6 at idle. I can't help but think there's a PE/AE Offset or Multiplier adding in more fuel than my Accel Enrichment AFR of 12.8. Replaced spark plugs the other day and they were all (6) black indicating rich but like they were a slight bit washed with fuel.

Originally I had thought the TPS was seeing a small amount of false input but the reading is very loyal to the actual throttle position and is not false.

Yes it's only a race car on a dirt circuit track but there's a part of driving this thing definitely needs tuning!

Any help or suggestions please, especially relative to TunerPro RT's XDF terminology would be greatly appreciated!

Side note, has a cold intake right behind front grille, very exposed to cool air + extractors and an exhaust system that will provide even a supercharged engine NO restriction! Otherwise stock standard.