If your a beginner a 8.5 will be plenty fast enough.
A 6.5 will be too quick and you will only find it hard to drive and break the car more often.
How did you "clean" your ESC?
If you need to wash dirt off your car then you need to remove all the electrics and use water or wash it with something else
(I like to spray a bit of WD40 onto a hard brush and use that to clean the car)
Water + Electrics = Bang.
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