Low pressure on high side of A/C system

Working on 2002 chevy s10 with 2.2 liter engine.
I replace the a/c compressor and accumulator. I filled the aftermarket compressor with 8oz of PAG per the manufacturers specs. I flushed the system pretty well with an approved a/c flush. I evacuated the system down to 30 in/hg and it held steady for over five minutes. I put in about 2 1/2 cans of R-134a. The static pressure on the high and low sides are what they should be for the ambient temperature, low 110psi, high 115psi. When I start the truck up and turn the a/c on high the low side measures 45 psi and the high side stays at 115psi. Mfg specs call out for 41-49psi low side and 245-285psi on the high side at the current temperature and humidity level. At 95 degrees ambient temperature, the a/c was putting out 60 degrees. Everything seems to be functioning fine except for the low pressure on the high side.

What could be causing the high pressure side to be low by over 130psi?

Thanks.