I use the mp fan and thermal clutch setup with a factory shroud and water pump for an a/c car.Never runs over 180 unless idling in the summer heat for an extended period of time.
Have you verified your ignition timing?Retarded timing can contribute to high temps
If I had to guess I would say your fan is either not pulling air or not pulling enough air.Make sure you clean the fins on your condenser as well to get the maximum amount of air through it.