.............I would like to add that I have never driven a Z4 on falcons. So maybe they are different on that chassis. I have only driven them on a R32 golf and a EVO.
Maybe that's the point, I can well imagine that a car with a weight bias in front of the wheels and tendency towards understear will lean more heavily on a (driven) front tyre, than say a Zed, hence maybe a Falken may not suit you/your driving style for a R32.
I can only echo others in saying that the Falken 452s transformed the Bridgstone RFTs nasty tramlining, mid corner bump-steer and crashing. Yes slightly softer turn in but much faster A to B on real roads because more tread is in contact with the road more of the time - pointing in the intended direction.
IMO the Falken 452 is a good performance tyre that happens to suit the Zed, but accept that more expensive alternatives may be slightly 'better', however the original spec Bridgstone RFT is not one of them.