I run a very thin electric fan in between the AC condenser and the radiator along with a 7 blade clutch fan that has a fan clutch eliminator a machinist buddy made for me, I have a 24 inch 2 row (1-1/4 tubes) Griffen exact fit radiator and a 180 degree Milodon T-Stat.
Works well, if you have the room in front of the radiator for the electric that might help.
What motor is in the car and what condition is it in?