The rates you list for the front, are probably a bit over the top. I have 350F/200R, and the ride is firm, but not harsh. I actually like the ride quality, as it's only marginally firmer than before, when I had the ST springs.
My setup uses 7" x 2.5" Eibach front springs, so I would venture a guess that 7" springs are plenty long enough. Any longer spring would require lowering the bottom perch further, and wouldn't be of any real benefit.
With 7" springs, and a 4" threaded collar, I chose 5" from the top as a spring perch location. This will allow me to adjust from stock hiegth (or higher), to ~3.5" lower than stock. The latter setting will not allow much travel before the strut bottoms out internally.
The location I chose for the spring perch also prevented he need to relocate the brake hose bracket on the strut housing. Going any lower would have required lowering the bracket as well. This was on S2 strut housings, I don't know if SE housings have a different brake hose bracket location. The SE housings that came with my coilover parts have had the bracket relocated, and the lower perch was 5.5" from the top of the housing. I may use these on my SE, which is destined to become a primarily track use car. I doubt I would daily drive an SE with RB intake and edelbrock 600, in a fairly stripped out car, when I have the GS with AC and cruise.
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