So... No idea why my FFB has gone like it has.
Having completely reinstalled the game clean, and deleted my Logitech profile, the out-of-the-box default settings for the G27 cause some horrid issues.
When stationary and I turn the wheel slowly, the wheel mechanism GRINDS. Oh it sounds horrible. This doesn't happen when I'm stationary and turn the wheel quickly, but there is a high level of resistance.
At speed it's not too bad, but over the curbs and when spinning through the gravel, the level of shudder and clipping and just noise is horrendous.
So in the controller settings advanced tab, I've turned the gain down to 80% (I tried 0% and there was just no feeling whatsoever)
I've turned the filter right up to 100% (as the tool tip says it evens out FFB spikes)
Minimum force I have no idea what it does as there's no tooltip, so that's just on 12% which is default I believe.
I've had to reduce curb effects to 50% just so the wheel doesn't shake the entire desk house when i dip a wheel over a curb.
After all that it's still not great so in ever car I drive I have to go into the setup, general tab and turn the FFB down to 80%.
Not ideal but at least now the FFB is drivable and gives some sort of useful responses.
If anyone has a G27 setup that doesn't sound like a badly played violin and feel like a landslide, please let me know.
The Toyota GT86 is lovely, but then it's a favourite of mine and it's lovely in real life. The MiTo is also very nice and quite quick for what it is.
No idea what's up with the Nissan GT-R Nismo. It never feels like you're in control of it. Braking distances are 3 times what you think they should be, any acceleration just throws the car out. I had to turn TC and ABS on just to being the car under some sort of control, and even then the feeling of control is debatable.
I then tried the GT86 with factory settings (ie, TC and ABS), and it does make you understand why road cars have these things. I know it may sound sacrilege, but they almost felt nicer to drive with the driving aids on. And the fact that these cars have these things in real life made me feel less guilty about using them. Road cars tend to feel dreadful in games anyway, and maybe that's why. I've always defaulted to turning the driving aids off on cars that they can't actually be turned off in.
I have no interest in the Audi and the Miura was awful on Forza 4 and I don't expect it to be any better here, so I'll just leave that untouched forever.
Zandvoort it great, though. Really nice. I hear it's one of the very few circuits in the game that hasn't been laser scanned, but whatever, it looks and feels like Zandvoort. Actually, it looks more real than any other game I've played it in. It feels narrower, the run-off areas look like they have the slopes and elevation they appear to have in real life (I've never been, but watched plenty of races from there). The gravel traps are steep. The grass is long and unkempt (which, lets face it, is how all race tracks actually look unless F1 rolls into town), and they've captured the essence of the sand dunes the track is built on and around. The textures have that scrubby, next-to-the-beach look. And the lighting reflects that bleak, North Sea coast feel, even on the happiest, sunniest, brightest day.