Background: $42, 7747, Auto, 5.7 with a higher than stock psi fuel pump. Regulator is bottomed out and I'm still at I think 16.5psi(haven't checked it recently). Fueling tables are adjusted for this in closed loop.

What I would like to do is lower the fuel being used when in a cold start before getting to closed loop. I realize that when cold, the fuel requirements are going to be higher than closed loop, but I know that it's running richer than needed right now. How can I go about lowering the fuel, and are small changes possible in open loop so as to not go too far and make it run lean?