After reviewing the available data (such as it is) and consulting "expert" opinions, it's clear to the admins that we don't have the necessary information to accurately and fairly impose any external balancing.
We feel that the master server balancing allows for close competition between the two faster cars, and while it may favor one car or the other in some way, it's undoubtedly by a very small margin. The FXR remains roughly where it was with the patch Y balancing, which we also feel to be appropriate.
Therefore, for the remainder of the season we will use the master server/default LFS balancing. All teams are welcome to change their car model at this point, but the car you race in round six will be the car you race for the remaining two rounds.
Looking ahead, we will use the results of the final three races, and similar results from other endurance leagues to determine how to handle balancing for the 2009 season.
Thanks for your patience over this period of uncertainty, and thanks to the marshals, teams, drivers, and friends of IGTC who helped in our testing efforts.