i watched some of the top guys replays last night and they were all short shifting around 7k rpm, meaning most likely the engine has a flat top end with decreasing torque - the power limiter is used. its either the engine was bored up to have fatter torque, or, the car is very light with no ballast - i suspect the latter, as they were running with carbon hoods.
most likely their cars are lightened with at least stage 1 or even full weight reduction with no ballast and use power limiter to meet the PP requirement. when i have some time ill try with less weight to see if i can improve my time.
the top japanese guy was shifting at slightly higher rev so his engine might not been restricted as much OR the engine is worn - with no spec B bob to grind the car for you these days, he mustve ground the car himself. ...how can we beat the guy like that?