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Your time is going to change constanly for you are working with pressures and tempertures. You also have to rememeber your humidity playes apart too

ohm our your leads on compressor, check your power coming in to contactor

yes it seem that you mite have heat loss/ or gain in few the rooms like my freinds said. Have some one come and balance it out.

Not the best at this but if your sucken is low nas high side is high i would would say check your system txv