Correcting Scrub Radius

I recently stepped up to 295/30/18 tires on 18x11 wheels on my 2011 STI. In order to make this work I had to run a +15 offset wheel. The OEM was +55 and I was running +40 18x9.5 previously. With this significant change in wheel offset comes an increase in scrub radius. Doing some very basic modeling in VSup, it appears the scrub radius is about 2.391"s.

Attempting to help correct this I adjusted my camber at the top of the strut with my camber plates (as opposed to the camber bolt) to increase strut inclination and hopefully reduce the scrub radius. Based on the very basic modeling it seems this may have helped but the difference is marginal at best. I do have adjustable lower arms on the car.

My Questions:

-Is there anything else I can do to help correct the increase in scrub radius?

-As I increase the strut inclination, does this change the Kingpin angle? If so, as long as I run more caster than kingpin angle I should be ok in terms of dynamic camber?

I think you mean reduce? In practical terms, no, because the strut and axle centre lines are fixed in relation to each other. However, increasing the camber alters the pressure/load gradient across the tyre/road interface, moving the load inwards to a similar effect. It also should improve tyre loadings when cornering.

Yes, review what "KPI" is. Depends on your setup and what you're using it for, what you're thinking of in the use of those term, and what the vehicle is doing?

I word things the worst way sometimes. Yes, by "correct the increase" I mean decrease scrub radius. Thanks for the response. It's primarily an autocross car right now. Does some time trials work, but in the last year it's primary focus is SCCA XA class autocross. Went from -3.5 degree camber to -3.8 with the increases tire size and it felt good at the test and tune I was able to do.

As far as KPI, I only mention it because I was reviewing the lessons and it caught my attention. The way I understand KPI from the course, it seems that as you change camber at the top of the strut via camber plates, this would alter KPI slightly. I'm guessing this level of change is insignificant and likely unnoticeable by an amateur like me. I just like understanding the concepts and want to make sure I'm thinking of it all correctly. I'm currently running 8.4 degrees of caster, so I doubt the very slight change in strut inclination is enough to cause problems with dynamic camber.

Anyway, thanks for the time and entertaining my questions!