Sorry, no help on the fuel numbers but, I gotta ask, is there any snow anywhere at 2500' or are you grass/mud draggin? I would think 12 psi at 2500 especially w/o a low comp head will take some quality fuel as well. Good luck. EW
As a racer you must understand that tuning is an on going thing. I've spent alot of timing just trying to get mine to run good. It's like a carb, you take a run and listen to the motor as it winds up then stop and make changes to the psi numbers. Mine came with 42/50/60 at 50 /50 race gas at 1700 ft. It is running ok w/ 39 /45/45 but is still rich on top just watch the egts they say it will run all day at 1250 to 1300 degrees. LOL