It's rare but possible the A/C is overcharged or has some other issue (like an orifice or receiver blocked with debris from the fragged compressor)...when line pressure shoots up high, the compressor is loaded up even more than normal.
These little engines suffer a lot of loss of power and idle stability when the A/C works right...if something is wrong with the system, it's going to load up the motor even more, and manifest in ways like what you're seeing. I think I'd have the shop that did the compressor run a check on high/low side pressures to rule out this kind of problem before chasing your tail...