This weekend I did refill to the right amount the auto transmission. It was a little over a quarter low, added the Lucas treatment too now it drives very smooth.
Check the tires, 2 were kind of low, I am trying with 30ish front 38ish rear.
I did replace all the temp sensors (the one for the ECU and the one for the instruments) with the thermostat. I found out the thermostat there was upside down and probably the wrong type. Other than making a pretty mess with coolant, pretty straightforward and kind of fun.
Refilled coolant and now it seems to work just great. Temp works as intended so I believe it was not overheating just bad reading on the temp sensor.
We'll see how all this holds up.