I understand what youre saying, I guess I just cant see where it would help you much to limit the travel of the upper spring, because basically that's what its doing, travel it down to just say 70% of the upper spring then put all the pressure on the lower spring. I checked my rear out earlier because I'm getting old and stupid and couldn't remember how I set it up, My rear springs are 200 on top and 250 on bottom.I took a strap and sucked it down till it bottomed out, My top springs were 80% roughly collapsed, and the rear were compressed roughly 3" give or take I didn't have time to get technical with my measurements, I was doing this as I was running my cnc mill.
I don't have mine setup where I do not need tender coils, I'm going to try and play with some more springs here shortly just to figure out some things. The only issue I really don't like on mine is I can bottom out my rear when I really hit stuff hard, which with what your saying I could help with the spanners run down(if they were still on the shock) to where it would get on the lower shock faster to create more pressure.And I understand that but why wouldn't just stiffening up the compression do the same thing. Because it really looks like my springs are compress perfect at full stuff with the uppers being 80% and my lowers being several inches of compression.And it really is very smooth riding There is probably to many ways to get to the same end with these things.