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Let's see... An evaporator temp measurement of about 40 is ok, and your superheat of about 15 degrees is a little high. Try raising your evaporator temp to about 50 and play with the TXV to keep at 15 degree temperature rise. This will allows allow your minisplit to run a little more efficiently and will increase its capacity.
There is no need to dial back your water flow. Let it stream through there and increase the LMTD (fancy way of calculating temperature difference). There is no need to have "cold" water leaving the chiller tube, water has such a high heat capacity that the heat is removed without such a big temperature difference. Obviously though it needs to be lower than your desired temp but give it a little time, your system is large and will take few minutes.
Don't worry about the compressor, it will be fine if your AC guy put the correct TXV inline (they are sized for system and work well, try not to play too much with it). The suction line should be insulated and not dripping while your liquid line (the line from the condensing unit) will be about 5-10 degrees above the outside air temp.
Oh, I just read the rest of the post.... try and get back to the original settings of 52F chiller input and 64 exit. That is a good setting and falls with what I said above...
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