I have no answer to the Query above but...
Go figure... Today I have my head out the window while I'm rounding a slow lumpy off camber corner in my folks neighborhood... and SQUEEEEEEEEEEEEEEEEEEEK...
HAHAHAHAHAHAHAHAHAHAHA
Guess that's what I get for patting myself on the back about how good a jpb I did buying these springs

Every time you get all high and mighty the good old universe is right there to knock you down a peg eh

. O well time to get out Greese gun and the
white lithium greese(Double bump for WL Greese, I also use this on my steering stops, lasts for a good while and even holds up to water crossings somewhat well) and go to town this weeekend.
I still think my Springs are great, but hey they're leaves and frankly thay're all gonna squeek to some degree at one point or another. I think it's easy enought to fix it, just lube them up, but the nature of the beast says that they will probably make some noise here and there. I tell you what I'll take the nice ride and the added capacity with squeeks over the saggy *** and slamming off the bump-stops over every bump like it was with the stock springs eh

.
Cheers
Dave