I have to agree with The Doktor in that the current classes as they stand to me seems fine. That drop to 10.5t in clubman is giving the lads who are not comfortable in modified a very equal class to run it with what is still a quick enough motor for are track. I dont see why we should drop the class to a 17.5t just to slow it up. By changing the motor limit you are only forcing people to choose do i run in modified ( most likely not as its was the reason for moving to clubman) or go buy a new motor
and not be happy because a 17.5 is that bit to slow for them to enjoy.
Being practical and grouping new drivers into more favorable heats would be the direction i would prefer see happen. As said before most rtr with brushless setups nowadays are suitable for the clubman class and as stated earlier it would probably require a newbie to change out motors straight away to meet a novice class motor rule. I now that wouldnt be my ideal start to be told i got to change my motor i just bought to run
Nothing to stop a newbie running with a higher turn motor as it is in clubman. Up to the individual.