Hi...my name is Eric and am very new in this forum....
I was just reading your topic and was in this very situation last year....We have similar cars (Galant GTI) and had a set of GAB's for the VR4 that I purchased second hand....I did not realize that the VR4 rear shocks had higher perches compared to the GTI.
When I installed it, the rear was waaaay up...so I experimented with different combinations of cut springs and lowering springs and it was still to high up...Even thought of modifying the part of the body where the shock mount sits....glad I didn't do that...
Eventually, I took the risk of lowering the perch, and reducing the shaft, cutting it near the top by two inches and re-weld it again....I was in the mindset that
if I did not cut the shaft....the strut would be half compressed all the time, which I thought was bad.....
I was not really thinking this thoroughly.....
Anyway, here was the result:
The Good: The car did sit on the ride height that I wanted. It had all the characteristics of good handling, taking all the corners faster that ever, no swaying, little bit of bounce, but tolerable. I had setting number 4 on the GAB's However this was on good paved asphalt or flat concrete roads.
The Bad: Roads here where I live is not always good paved asphalt or flat concrete roads....maybe 50 percent of the time only....potholes are everywhere...so in the end, I destroyed two wheel bearings (rear), blew the rear GAB's (it always bottomed out) and destroyed the rubbers that held the springs by the mount.
Maybe I didn't think about the process or I did something I should have not done....but the thing I learned is, next time, buy the right equipment....
Just sharing my experience....Good Luck with your plans.....