2003 ranger 2.3L AC question

[Hoof]

I have replaced compressor, condenser, evaporator, accumulator, orfice tube all hosed and both high and low pressure switch … all brand new. Pulled and held vacuum. I attempt to load with 134a. Low side goes to 100psi+ and high side goes to 125+. Compressor clutch engages in short spirts and low drops to about 80 and high jumps to about 135. And that is with only 1 can of 134a. Any suggestions on what might be my problem. Should take about 30 ozs but one can is 12 … naturally still blowing hot. I am afraid to attempt to load a second can. Thanks in advance.