I converted my C4 to RWD, including C2 uprights/wheel carriers, but have gone from M030, to Bilstein, to regular suspension and now have Koni and H&R, they are perfect for the road, firm as M030 nearly but comfier than stock.
They just work.
I'm genuinely blown away.
I have gone with agressive rear camber, with a fair bit of toe in then not very much front camber at all with a smidge of toe in.
This is very neutral, back end extremely planted, steering weight nice and heavy but positive, doesn't chase cambers at all, just lovely.
It would be no good on a track with that geo as you would want the back end to kick out more, but for the road it is very, very confidence inspiring.
I love it.