Alright folks. I recharged my refrigerant in an effort to introduce new oil into the compressor (since the oil and refrigerant are mixed). The AC compressor unfortunately still seizes. I found that if I reduce the pressure (supposed to be 40-50 PSI on the low pressure end) to 35 PSI, the compressor no longer seizes, but at the expense of less cooling in the AC unit. It seems possible that something is jamming the refrigerant path at this point.