I had the car pretty dialed in for autocross in STR trim, and as soon as I wrote the check for the Harrop, I started in with the extra suspension allowances and did the traction mod first. The car became horrifically pushy and only got worse with the wing. I finally got it out a couple weeks ago for the first autocross since supercharging it and as expected, it was still really pushy. Since then, I went up 10% in rear spring rates, went up a couple steps in stiffness on the rear bar, and did the FLCA's which helped roll center correction. I also added the 4" splitter but I'm not sure what to expect for additional front end grip at autocross speeds with it. So, we'll see if all of that was enough for an autocross coming up the next two weekends. The immediate plan if it's still pushy is to take the last step out of the front bar and go full soft. I'm hesitant to go stiffer on the rear bar until I get the Giken diff.
Here's my first day autocrossing it. It was a bit of a mess but after a heat cycle on the new Yoks, it started to come to life a bit.