I tried one recharge at my buddy’s place; the delta was pretty small. Same issue. I recognize the low side pressure read was kind of low based on what I found on other threads around here; might have been worth a quick shot from a 134a can to give ‘er one more go. But here we are.

I’ve had a compressor lock up when just recharging with an off the shelf can (I was young and didn’t know what I was doing, but still), so I was wary of just dumping some more refrigerant in.