Currently it stays at aprox 6.000 RPM, and gets to the engine top RPM(8.500) when the max ratio is reached?, i dont know well how it works. Anyways it will be a good adition in the race ECU to "set maximum RPM" like the 2step or the normal RPM limit, thanks devs.
An adjustable rpm for the CVT sounds like a good idea. In the meantime you can play with the Multimode mod. I think its this one: https://www.beamng.com/threads/multimode-cvt-for-official-vehicles-and-support-modding.66218/