So its all about the non skid coating
Is your court really asphalt?? Most tennis courts are concrete and then painted with a non skid coating. Until recently, our club was operating from a tennis court and the grip was excellent. We drive only electric 1/10 scale and with Takeoff cs27's or cs22's, the cars had no grip problems. This all depends greatly on the paint coating used.
Do you have an idea how much the coating costs?
It is going to be fantastic for and electric 1/10 racing.