100% Its a combo - mine has a fair bit of weight at the back and I don't think the rear brakes are doing enough, it has the most awful abs system too - if you hit the brakes too hard/quickly it freaks out and goes into 'ice mode' where it essentially cuts braking effort to the rears and the pedal goes super hard, its very disconcerting at 120!! But its cat and mouse, likely with proper track tyres the silly ABS would have been far happier.
I know I wasn't flat at the first green line drawn below because
@Myfanwyi was giving me the universal pussyole go full throttle you gimp gesture with his hand, but I was flat by the 2nd green line then hard on the brakes from around 2nd orange line when the car was straight. My speedo was reading 120 by there, I wish I could be braking at the blue line!!
First orange line is a stab of brakes that I don't think I really needed, in the dry the car was very stable around that area of the track and I suspect could have been going a lot faster.
View attachment 1755357
I'm going to chuck the ABS in the bin and fit a comp brake balance bar setup so I can adjust bias to get more rear effort in the dry.
Regardless, by the afternoon I was faster than I've been before thanks to the weather and finally dropping my tyre pressures low enough!