40 shore foams seemed to make it nice all round for me, 37s - didnt like them at all, actually found it to have LESS traction!
Otherwise a decent set of rubber wheels should do you fine. But I loved 40 shore all round for a very long time.
Car-less (Velox V10 or 733) // RB T10.5"+" (JB Modified) // Bluebird BMS-990DMG (St) & BMS-631 (T/B) // ATS 16% // Capricorn Wheels // Protoform
"70% of the time, it works ALL the time"