I believe once the human element is added, in that the FZR's H-shifters need to be somewhat taken care of and is somewhat easy to make mistakes with, that the balance won't need to be as drastically changed (80+kg) as in X. From my brief experiences with the GTR's around BW (a few laps each), the FXR and XRR are initially much easier to drive smoothly consistently than the FZR. If the FZR is faster but requires a lot of concentration not to make a big (race-ending) mistake, then I think the balance is effective.