The servo rubbing on the centre drive shaft is not uncommon. I had to trim some of the mounting bracket off my Futaba servo to stop this happening. If you have a read of Jimmy's review of the ZX-5, I believe he mentions it aswell.
The chassis of the Kyosho is extremely strong, I doubt you will benefit from changing it to a carbon fibre version. Carbon fibre will be stiffer but it will alter the handling of the car which might not suit your driving style. Hope this helps a bit.
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