2) Could be a lazy thermostat. It should go to 80*C within a few miles and stay above 80*C. Seems like it's stuck partially open delaying reaching operating temperature but not opening enough to allow proper flow under load. Are you using SVO as coolant as well?

For kicks, remove one injector and have it tested for opening pressure and spray pattern. That will tell you if you're heating the SVO to an acceptable temperature.

Sixto
87 300D