Compressor is fine , as it is making 400 psi plus. Dont do that too much it wont be fine
Icing at the low side of the orifice means the orifice is plugged, or is way to small. What color did you put in?
Also, it sounds like the expansion valve in the rear (orifice if on an aerostar) is also plugged or not responding correctly.
Did you check / flush the rear lines and check the rear TVX device?