What folks say about the compressor being too small is right on.
13.7F for a txv is a little on the high side for water evap but close enough. The txv closes down to maintain the 13.7F SH - aka allows less liquid into the evap to boil, hence also less total heat gain of the refrigerant cycle. If the txv has to close down to maintain SH, it means either the compressor is too small as mentioned as a possibility - or, there is a piece of junk in the line before the compressor, the screen in the compressor is clogged from debris left in the lines during the txv and compressor changeout (true if the 54psi is right at the compressor inlet) , etc.
The shop DID put in a new filter dryer and purge the lines when they did the work, right???? If not, time to buy a vacuum pump and learn some more diy <G>
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