ok maybe this helps.
remove your heat exchanger. add a tank of at least 3 gal. when installing you can install two elect valves in the freon lines,
that is where the yellow and red wires come in .. with those two valves,you can close off the freon to the cabin ,=all freon to KC making your IAT's in the high 40's on a 90* day open the valve to the cabin and close the valve to the KC and you have AC in the car,, open both valves and you have both working,
first you need to increase the low side to 55 to 60 lbs or both will not work properly ,, also get all the air out of the water side.