Mine adjust from a little too soft for street (for me) to quite a bit too stiff for track (for me). To be fair, they are valved for 6/4 springs and I am still running the 5/3 springs that came with them. So still playing, will mount Swift springs eventually just to see what they do.
That is basically the performance "sweet spot" for the GT1 dampers, that is where they are designed to function their best.
It is stiff, it is suppose to be stiff, because it is suppose to ram your tires into the ground and make them stick.
Give that a go, should be a lot better.
And if you need to, soften the rear a little bit just to keep that back end a bit more stable.
You want turn in, but you don't want sudden snap over-steer.
Let us know how it goes, looking forward to hear what you think.
Jerrick