S300 b18b basemap very rich at idle.

[Chumpfriedrice]

I have a b18b1 bottom end with 11:1 compression pistons/forged rods and a stock head. I purchased s300 from phearable with a premium basemap. Last night I hooked everything up and started the car. My afrs on my wide band are almost pegged rich. (10-11). The engine runs rough and you can tell the car is getting too much fuel. I plugged in a stock ecu and the engine runs great! I'm assuming that some parameter isn't set up right by phearable. They have been contacted but I'm looking for opinions on what to check myself to try to fix this. I'm very mechanically inclined but new to tuning. Any help is greatly appreciated!