Change that "sharpen" to "normal" and test.
Sharpen might sharpen picture, but it softens/blur FFB, and it makes game go slower than "normal"setting.
Tested your golf, from your garage just to get some car what you're familiar.
Steering characteristics from options has to be "simulation", "amateur" helps on steering really much, practically makes impossible to understeer car, "professional" is helping lot too, not as much as amateur, but lot.
Only working option is "simulation", others are killing possibility of turning too much what will/should make front tires either slip(understeer) or grab and make rear oversteer.
And I'm not joking about this, your golf is freaking easy to use as test car, you're able to floor throttle out from corners when using amateur or professional, but no way when on simulation, on simulation it understeers so much on corner exit at you have to feather throttle.
Things what HAS TO BE SET before testing anything from GT6 physics are following, MANDATORY.
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And yes I'm using G27, and I can read at game THINKS at some of those settings are not for G27 or steering wheel at all, but that's total bullshit from PD.
Only thing what can be changed from there is "power assisted steering", but when it's on it shows flaws better, without it is easier to drive, but when hunting changes on steering it should be on.