Think of it this way: With the penalties the FZR now handles with an empty tank as it did before with a full tank. Yes, of course it is a bit more clumsy, especially if your old setup's spring rates were calculated with the wrong sprung mass. I wonder where the added mass will be put in patch X. Either in the front, which will increase moment of inertia, or in the rear, which will worsen the front/rear weight distribution.
@TBO:
Currently it's a bit difficult to see the balancing of the TBO class since the XRT is so popular in W9+. The FXO is the least popular car now. Only seldomly someone chooses it who can really drive it on the limit. That's why the FXO seldomly scores the quickest laptimes though it happens once in a while.
Right now I can't see any car as too superior or too inferior. After patch X has settled and we know the new WR times we can perhaps change the hp figures by one or two for patch Y.
Vain