As standard the car is (as you say) diagonally split.

I've re done mine and now run a front/rear split... not as safe (if one braking circuit goes down) but it means I can run a brake bias valve and set the rears up to my liking.

Makes a BIG difference with sticky tyres, the rears can get away with doing so much more than standard.

PS, why didn't you get your brake pipes powdercoated , good job though.

Rob,