I don't think you will have to kill the 200mm touring class, It will die by its self.
I myself have not bought rubber tires in over a year for my Kyosho car, Foams are way more consistant and less of a head ache.(you dont have to glue them)
At my track there is only 2 class's of nitro being run, Outlaw foam and Super10, sometimes there will be a few Impacts thrown into the mix, but the track is too small for 235mm
I say leave the rubber tires on the real cars and electrics