Alright, here's the deal. My Tein HA's have just been rebuilt by Tein USA to handle up to 12kg/mm springs front and rear. Right now they're in transit to Koni USA to get shock dynoed as I've yet to see a Tein HA shock dyno other than the one Tein provides in the manual. Tein was able to give me some reference points that they used for the rebuild, but I wanted to see what % of the clicks were useful and what kind of adjustment range the shocks had as well. Tein would do this, but charges an additional $25 a corner for this service.
Now, I have a set of 8kg/mm, 10kg/mm, and 12kg/mm springs that I can use currently. I was thinking of doing the 10kg/mm in front and 12kg/mm in rear as a first try as the car didn't feel all that different with the 12kg/mm front and 10kg/mm rear when I installed that for a few weeks. Though I never autocrossed or pushed the car very hard with the 12kg/mm front and 10kg/mm rear.
The rest of the setup is Spoon upper bars, Tanabe lower bars, Progress rear anti-sway. All factory bushings (except rear endlinks), and probably will remain so as the car is still a daily driver. I just wanted some additional rotation out of the car and for it to remain easily streetable. 10kg/mm front and 12kg/mm rear sound good?