I agree with what was said previously, swap the receiver drier and put a better fan on the condenser. Make sure no leaves or debris is blocking air flow. Make sure the refrigerant is filled exactly to specs, it wont cool as good overfilled and underfilled. You can't swap the condenser or evaporater to a bigger unit without reengineering the whole system. Its basically made for your amount of refrigerant, length of lines, volume of condenser/evaporator, size of cabin etc.