I hope both you and the car are ok.
are you running VDC in 'R' mode or 'Off'?
I know there are a few R35's doing the rounds at EC with stock suspension. I'm sure Dunc (LSX 438) will be able to share with you his experience. Stock suspension though is very good, it has lapped the nurberg in a very quick time! I would be concerned your alignment is out or there is some damage.
Before I modded the car the fastest corner I took in it was only 135-140 and that felt quite easy (no big sweepers here at QR, yet to get to Lakeside).
If you are looking for a suspension upgrade I now have MCA coilovers installed and at QR up here the car handles superbly through turn 1 at about 150-160 (with slicks) if I really nail that corner, and is a cake walk if I pussy out and log 140 through it. I drive in 'R' mode for now though as I get used to my new setup. I also run whiteline antiroll bars front and back, set to soft for now which is still stiffer than stock.