I'd replace the condenser. Operating a high side pressure @ 400 psi indicates a system internal obstruction and will cause compressor failure. it's also very important to remove all moisture from the system to prevent sludge formation. Internally, AC systems have to be impeccably clean. The...
Lucas is also a polyurea grease but it's not shear stable like John Deere's. So it isn't compatible with other types greases. I believe JD grease is re-branded Mobil Polyrex EP 2.
All I want is the original factory-filled grease that came with my Branson.....but that information is elusive.