It doesn't constantly spin, only for few secs then it regains traction. Might just be combination of aging tyres and the increase in power. I rarely put the pedal to the floor bit have noticed it twice esp on cold days. Other CVT owners might be able to explain more. Flooring it from a stop i.e. traffic lights will result in zero wheelspin tho.
The same transmission is used in the Cube alpha which has 101ps which is more than mine but it has electronic 6 speed control. HKS designed a turbo kit to be exclusively for the CVT Cube cg13de and there havent been any problems reported. So the transmission is operating well within limits I guess mine is around 90ps max. If it was slipping then the power wouldnt get to the wheels.
Colt357 once spoke of the taiwan owner club member "FCC" rewriting the NCVT ROM and upgraded intake/exhaust making the car do 0-60 in 6.9s secs with no reliability problems so far