I did a bit of testing with the E3:
The shaking is due to missfires. They start as soon as the engine is overheated. You can test this properly with a Spitfire because as soon as you are airborne with the E3 your watertemp is up to 80 and your engine starts to missfire.
You cannot decrease the water temperature below 80 degrees. I tried a lot of high speed dives with 0% throttle but wasn't able to decrease the water temperature.
If you fly without temperature effects enabled, the AI seems to have no problem keeping the water temperature at bay.
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