Can't say if it's off as I don't know the car specs, but doing races vs AI on cars near the same tier in Road America (993 s2, zr1 tuned, f40, arch CTR-1, 512 tr CS, Jota, arch Supra S2) I'm having trouble to fight door to door because I'm forced to brake way sooner after long straights than in most other cars on SM's (bearing in mind that some are much lighter, o.c), even if the car handles brilliantly on coast or under power without tc. So as to set brake power at 80% only to avoid cooking the front/managing understeer. To note, the AI Jotas will ram other cars often on T1, T5 and T8, as they can't reduce speed so quickly as cars in front.
Without a reference, after reading the previous post I've tried to set the balance to 0.62 like the ks Countach (edit: looking back, that's nearly previous 1.0 value), just to see if it would help. The car became more pleasing to drive, allowing to brake later (nearer other ~>1400kg cars) and under more control/less understeer, even while keeping brake power at 100% on setup.
OTH, the VT with a similar balance to the Jota and higher weight, narrower tyres, seems much easier to stop safely, harder and later on SMs without cooking the fronts. So, it could be related to anything other than just balance, but then, the approach speeds are lower too.
I've reverted the change, as aphidgod would surely know better about this car, but I'd would like to bring this into attention, given that this car is capable to attain very high speeds on track and it's quite hard to bring to a stop.