Sorry this might be a bit of a rushed reply. Traveling at the moment but for fun which is NICE
I forgot to mention the most important aspect when purchasing dampers at these levels IMO... Do not underestimate the level of support available for them. I decided on JRZs a few yrs ago because of the available local support. The support I've received such as periodic dyno tuning/matching and rebuilding has been nothing short of phenomenal. Kudos to Frank Chen, one of the original distributors since the 90s. I originally was very close to purchasing the 'Super Ohlins' line from Japan but the lack of support and uncertain communication (I had to purchase thru a friend) got me worried for the long run. Support, support, support.. any of these dampers can make you happy with the proper support IMO. No surprise, as KW becomes more of a consumer brand, i've heard their support/warranty has taken a turn for the worse as compared to before.
I'll have to qualify that my DFV experience has only been on the S2K and BRZ and both were Ohlins tuned and Ohlins off-the-shelf SKUs. I noticed no 'specialness' about the damper tune. The range wasn't all that deep. Thinking back, perhaps i'm confusing sophistication with the inherent limitations of a 1-way setup. Granted they both suffer from extremely poor droop travel in the rear. So take that with a grain of salt. I suppose the DFV can shine when truly abused. I certainly can attest that the JRZs are noticeably affected by heat. I have also heard from trusted sources that the precision machining of the valving, shims, etc.. plays a role. My JRZs are dyno matched fairly well so I didn't care from that standpoint. I'll take Dave's impressions over mine on the DFV at the end of the day.
Ultimately, I think a MFG tune will get you about 70-80% there. That's assuming they tune the dampers to begin with and in doing so they have to pick a set of criteria for their ideal target audience... who knows what could be. Could be the occasional track but mostly street guy or could be the Hellaflush/Street/Track guy which is what I think the Ohlins R&T for the S2000 and BRZ was designed for. Tire choices, spring, sway bar, car's weight distribution etc.. those are all personalized which is why I think ultimately a great 1-way tune seems rather elusive on a high end damper with a lot of range. I've given up on it which makes me want an OEM CTR. They've adjusted it for you and from what I hear it's a great tune for most of us.. unlike the OEM tune for the Focus RS.. but I digress. Please folks.. I'm not an expert here... i've just been tinkering with the suspension on this car for years. For example, with the JRZs I started with a 14k/11k setup on R-comps. Then 11k/9k. Then 9k/9k. Then 9k/7k (current). I'm waiting to try 9k/8k now because it's pretty good with the 9k/7k now but with the OSG LSD and the heavy supercharger in the back, under med to heavy accel I feel there's simply too much weight transfer to the rear causing more front understeer than i'd like but it feels pretty good on high speed and low speed turns but I want to dial down the on-throttle understeer just a tad bit. I've tried 9k/9k but I feel with my sway bar setup and other things on my particular car like the choice to stick with Michelin PSS tires, 9k/8k might be the sweet spot for my driving style. Yes, I still have to play with rake and alignment. This is where i'm at after maybe 3yrs of tinkering with this setup.
I still think a professional driver/tuner can eek out 20-30% more out of these JRZ dampers with some development driving by simply adjusting knobs - we'll see. My benchmark is the 650S which I have some decent seat time in. I feel the suspension tuning on that car is still better than my NSX but only by about 20-30%.