I made a lower pod plate (with added cooling fins) to try and keep the motor a little cooler over the 6 minute run with my GT10 car:
I think it is fair to say that the motor still gets pretty hot (!) but the fading because of that heat now happens slightly later in the run.
This plate is 6 grams heavier than the standard carbon plate but I also cut away quite a bit of uneccessary material from the main chassis which more than makes up for this extra few grams.
Cheers,
Chris.