Well, seems that my post has created some conversation...
Before you judge me on my decision to switch to coils, please know that a) I had exhausted all of my options to find the issue with my suspension, including buying a dealer compressor, control module, Valve Block, and new springs... to the tune of almost 2k.... not including labor, and down time of the vehicle.
When I continued to have issues... I came back to this very forum, and asked for assistance... Where were you with your .02 then? I say this out of frustration... If you were in my shoes, and had looked at all of the options that I had, and had already exhausted any additional income I had (while being unemployed), you would understand that my decision to convert to coils was out of a simple desire to move on with this OBVIOUSLY sub par system on ALL Range Rovers.... They all fail... fine. I knew that, and I did what I could to fix the issue...
I purchased a legitimate product, which has been used for years, without any apparent downside other than making the vehicle non stock, and in my case... BETTER.
I'm not sure what the mechanic meant when he said the rear of the truck was sagging about 3 inches below the fronts... I've confirmed with the manufacturer that these springs were installed correctly... I can't see any considerable difference or sag between the front and rears... and in fact, my 20 mile drive home from the mechanic was great! I rode nice and high, and smoothly over the terrible New England roads...
I'm finally happy that this is behind me.
Thanks to all for the positive feedback and assistance in attempting to get my truck back on the road...
Martin, I assume your .02 was meant for someone else, as I only came here for help with an issue, and have NO INTENTION of swaying anyone into the benefits of COILS... I however... am very happy with mine.