I think the FZR shouldnt be able to kill itself unless theres a decent amount of abuse handed to it, and it should be weighed down a little in return. It'd work better at endurance level as well as sprint races, which lets be honest is what 95% of the people driving the car are using it for.
They need to be competitive at multiple uses, evenly spread over various tracks but competitive to race together over 6 laps as they are over 6 hours. How you do that i dont know, but if close racing in a multi-car class is the aim, it needs to be looked at from as many angles as possible.
In sprint races tyre wear and fuel econ makes no difference, its down to which car puts its power down the best, handling and ease to drive. The FZR is already easily the fastest, the FXR the slowest. I *hate* rwd cars (with a passion) and i can drive the FZR cautiously round most tracks considerably quicker than i can get the FXR round being as heavy and aggressive as i see fit. I remember spending about 30 laps in the FXR and doing a so-so lap, and within 5 laps i'd gone about 3/4sec faster taking corners with extreme caution, that was round one of the longer Aston tracks, and it just seemed very wrong that someone who couldnt drive rwd cars in comfort could go faster in the FZR over a FXR with such ease and little effort, if i can do that then imagine what a decent (!!) driver can do with the FZR.
In endurance races the bigger picture finally comes into account, then the fuel econ, tyre wear and clutch overheat are something to use as positive/negative reasons to pick a specific car over another. While i dont care for public server racing, it surely should be a balanced playing field there too, just as it should for endurance racing for those who find that aspect appealing. How you make it even on all ground i have no idea and wouldnt envy the task of trying to make it even, but those are my thoughts on it and i think sprint races actually get overlooked because of things that matter in 100+ lap races but make sod all difference in a 10 lap race.
Also, if the XRR effectively gets -30kg (X's +30 removed) and gets the Seq box, while the FXR only gets -20kg and the Seq box, that means the FXR is effectively 10kg heavier as a result of moving from X to X30 at least, Do people actually consider it quicker than the XRR, over any distance, where it needs to lose ground on the other 2 cars? Seems a bit of an odd one to me, i wouldnt have thought anyone would consider this a competitive car for racing in anyway, easier to drive is one thing, but its still considerably slower everywhere anyway and now its lost 10kg over the other 2 it would seem.