So for 89+, there was a drop in height by 12mm. I'm assuming that drop is from shorter springs, but would that also affect the ride height measurement as shown in the TSRM? I'm not really sure how one affects the other, so just curious.
That depends on the ride height. My car is lowered 40mm and the front lca is still pointing downward from the subframe to the wheelhub. The rear i slightly pointing upwards at 40mm lower. There is another thread on how to measure this.