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Anyway, it's tyre temperature that's the key thing. Pressure is used as a "tool" to get to the temperature.
90-100c degrees is what you want across the whole tyre on an R888.
But that's going a bit OTT for trackdays.
Going with lower springs will automatically give you a bit more camber, so that would be the first thing to try. Then get the alignment done again once lowered. Max out the camber bolts really.
You need more negative camber basically.
As the suspension is rolling to one side it'll be getting more positive camber leading to sidewall wear.
A set of springs and some camber bolts would be the best place to start.
Maybe your sliders now working it's giving you a softer feel? Whereas before they were seized so the caliper didn't move much giving it a stiffer pedal.