I did have 1 other comment on low cooling.

There is another problem. The system could be overloaded with oil. There is a point, before hydro-locking where the dryer is full of oil(mostly full?). I've experienced this in my truck. I knew it was charged a little high with oil. I blew out the condensor and replaced the dryer.
For poor performance, the thermal cycling switch is a thermal couple- they can go bad. MB set them to cycle pretty warm. You can add a shunt resistor and bring it down from 48F toward 38F and see better cooling.
It's weird- I would have thought the electronic system would push systems closer to 32F. But when I researched the web- it looks like all the electronic cycling switches are higher. I've done this mode to american cars too.

Fred- what a comment would rather almost do a transmission job!

Michael