@Smasha:
What I would recommend, coming from someone who until (relatively) recently used the classic Logitech Wingman Formula Force GP.
1) You're talking about all the wheel rotation settings; Think back to the steering wheels available back when GP4 was released.
Most, if not all, would be 180 degree lock.
I can see from your last post that you currently have it set as that, so leave it there and focus exclusively on in-game settings.
If it's feeling like a truck, try turning way down - or off - the steering help if you haven't already done so, and have the Low Sensitivity Zone and Reduce With Car Speed sliders at 100%.
The steering help, though useful for some controllers, can be worse than useless if set to high, and the LSZ and RWCS sliders are as close you'll get to an in-game deadzone setting.
(Although about a 10% steering help can help give this feel as well)
2) Is it the 2013 physics?
For me, the poor sod who's played with a gamepad the last 3 years, I found the handling of the 2013 mod to be much more user friendly than vanilla GP4.
(Although I don't know, having never played it, how either compare to the '06 mod.)
3) It's certainly not Windows 7's fault:
That was a valid excuse for my old wheel - before it died, and before Logitech released some software to support Force Feedback on 7 - but not for something as recent as the G27.
4) Practice, practice, practice, practice.
When I had to switch to a gamepad, I nearly died the first time I played GP4.
It was that bad.
(I was doing 1:24 hotlaps around Interlagos with it..........I'd never done a 24 around that in my life)
Granted, I'm still pretty rubbish, but I've gotten better as I've goten used to, and learned to account for, the little idiosyncrasies of the gamepad, it's gotten more bearable.
Prime example, during the GP4 Central Championship; I'd been away from the game for about 6 months, and jumped right into the comp with a recently obtained gamepad.
Over the course of the event, I improved my time by the better part of 11 seconds; most of that came from various control schemes;
"Well
that chews me up in the fast corners, and
that" setting means that I'm driving a house in the slow corners, so if I change it to
that..........it means I'm driving a house in the fast corners and I get chewed up in the slow corners."
"But if I change
this to
that, and
that to
this.........."
Trial and error got me there-ish in the end...........and then I got the adaptor so that I could use my Xbox controller and had to start all over again.
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