06 ford e350 5.4

A/C not colder than 64°F. Replaced everything. Low side 55, high side 170 or so.
Needles bounce, scroll compressor. Fan clutch works. What else?
New parts: compressor, condensor, accumulator, orifice tube(front), expansion valve(rear), pressure switches.
Flushed lines, eliminated heaters, oem txv