Two years ago, I bought a 2001 ACR with the Dynamic Suspension adjustable coil overs. The owner had recently installed a new set, because the originals were leaking (27k miles). More on that later. I had researched Gen2 Viper issues and the ACR pretty thoroughly beforehand, so knew I'd want to replace the springs. I read somewhere that the German engineer doing the calculations had mistakenly included the down force of a wing, hence he arrived at the 1100 lb figure. The note said they should be more like 900 lb for the track with no wing. Searching the forums for what other owners had done, I learned that some owners had switched to 850 lb springs and others to 800 lb springs, while others had changed out the Dynamic Suspension for Koni or an alternate brand, due to their reputation for leaking. Of those that just changed out the springs, one or two said they wished they had gone with even lighter springs. So, that is what I did. Mine were pretty new (~1500 miles), so laying out a large sum on new coil overs did not seem to make sense at this point. Keeping my car mostly stock was also a factor. The super stiff ride was seriously aggravating a slow healing concussion; therefore, I quickly bought and installed the lighter springs. BTW, JonB sells the same brand spring as the original. I went with 750 lb for the rear and 400 lb for the front (original fronts are 500 lb). My ACR now rode much better, but still rougher than my wife's 2001 RT/10. More on this later.
To my dismay, one of the rear shocks was already leaking. I had planned to have the originals rebuilt and keep around as spares. Now, it looked like I might need to rebuild both sets. Speaking with a rebuilder, I learned that the Dynamic Suspension shocks leak because the shock valving and seals are not strong enough to handle the overly stiff springs. Made sense to me, because the leaking shock was a rear one. They cure the issue by using stronger components. Fortunately, my rear shock stopped leaking after installing the 750 lb springs. Maybe, now I'll get 50k out of them before a rebuild is required.
I was planning to go with even lighter springs for my second set, but JonB advised adjusting the compression or rebound first. I forget which now, but I chose to make changes to both. Turning the top knob (rebound if I remember correctly) from limit to limit, I counted about 30 or 31 potential positions. I set all at the 10th. I forget whether it was 10 from the clockwise end or the counterclockwise end. I was intending to set them at 10 from the softer end, but I guessed wrong. I learned this reading a post on adjusting these shocks afterward. Turning the bottom knob (compression if I remember correctly) from limit to limit, I counted about 15 or 16 potential positions. I set each shock to the middle setting. I am very happy with the result. My ACR now rides nearly the same as my wife's RT/10 and handles at least as well or better for the street. Might be worse near the limits, but I don't test those on the street. Misjudgements at a Viper's higher cornering limits are bound to be too costly. I joined SCCA this year intending to try autocross, so I guess I'll find out if/when racing starts up. I may be asking for adjustment suggestions from those autocrossing with Dynamic Suspension equipped ACRs, and I may need stiffer springs on all four corners. Hopefully not, but I haven't bought replacement springs for the other set yet. Sorry for the long post, but I'm hoping some here find it helpful.