You could only set those temps without load,and using a oversized compressor running in a deep vacuum.

no load temps mean NOTHING.

by doing this when it comes time to cool @ working temps @ working load, the compressors you are using are much to large, they will run up the power bill . plus the noise from a larger compressor and all those fans.

So don't go bragging about something meaningless ,it will come back to bite you. refrigeration is not like a race car,the bigger the motor the better, It the opposite the smallest motor running efficiently is the way to go for daily use

Running a compressor in a vacuum if not designed for that purpose will substantially shorten its life . You want the gas to do the cooling @ reasonable pressures.