Tough call on the brakes, it's a lot of messing about swapping before and after the track day. Bedding them in will be a pain too, as you'll have to do a hard first session not knowing the circuit and leave them for a good few hours to cure.
I'd trial them, see how they work from cold? Change them, go and bed them late at night and run around when it's quiet - get a feel for how much you've got. If they're shocking, stay on the road pads. You're hardly going to be giving it full beans in such a nice car.
What's your fluid like? How fresh, is it something like RBF600??
Tyres - you're not thinking of R1Rs are you?? They're great. T1Rs are deffo sh*t.