Did you confirm these readings by a manual gauge?. What worries me is that u said u added 30# and unit didn't cut off on higgins pressure. And 3riple corendrier , why don't you try locking out the circuit that is presently work good and run the other circuit by itself , the water temp is @ 42 degf so it will not need 2 compressors to run. At full load to come down lower
I did lock it out to run the circuit with the problem. The water temp never got down to 42 it stayed in the 50s.