" QUOTE" :"And here's the first run with R410A in the 1st stage . The thermometer on the right measures just after the condenser (subcooling) .
-60.7C is a few cm after the heat exchanger" . -60.7 is NoT subcooling.

How to measure subcooling:

Using a pressure temperature chart, find the saturation temperature for the pressure you recorded . The difference between the measured temperature and the temperature from the pressure temperature chart is the subcooling. Adequate subcooling is needed to overcome any liquid line pressure drops.