Thanks guys. It is a blast to drive. Despite the weight it is still a very sturdy platform. Not much to wrench since around 28 runs. Only the bearings in the rear wheel carrier can get stuck when i drive in the wet ... aside from that nothing.
I have now protected the bearings. Let's see if that helps.
I have made a small upgrade to my motor cooler
I have replaced the 0.8W and 1.2W fans with two 2.5W Sunon fans which has improved air flow significantly. Both fans are now better protected against stones and stuff. Since there is a lot of amps/power displaced by the castle 2028 motor (between 1.7 to 2.5kW average during a run) i'm trying to keep the motor in its comfort zone. I don't really know how efficient this motor is but let us assume it's averaging 85% then there is still a loss of 255-375W in heat which has to be removed.
This setup (with 8s) really is only for fun driving and i'm mostly driving with a short brake during a run (after 4-5 minutes) to check temperatures and giving the components the opportunity to cool off somewhat.