I emailed John after riding the 950# around. It's ok, with 6-7mm free sag and 35mm rider sag, but that's w/no adjustment. John basically told me that's it, he didn't want to send a 900# to try, that the sag #'s were in spec.
There are 3ea 1mm spacer rings on the spring of which I can remove 2 and that'll give me a bit of adjustment. The 6" spring is preloaded 1/2" w/ the collar all the way backed off.
Are you sure about the half inch of preload with the collar backed all the way off? I would have thought that the shock body was threaded and you could back the collar all the way to zero preload. If what you say is true then they are giving you too long of hyperco springs. You should be getting a 5 1/2" spring so that you can properly set the sag.
This situation is what I think is wrong with the stock setup as well. Too much preload on too soft a spring. I guess I really need to take mine off an measure the preload and spring rate.
If you really bottomed out your shock all the way into the bumper (on say a dip in the road) then the spring you have is too soft if it has 1/2" of preload at a minimum on it.
I've designed several shock specs using penske, which use hyperco springs. The hyperco springs come in different lengths.
Its very hard to speak absolutely using an internet diagnosis but you have to get the spring rate right in order for the valving to perform at its best.
This doesn't sound right to those with just a cursory knowledge of suspension, however the following is true. Alot of preload on a soft spring is often much harsher over small bumps and bottoms out thru g-out obstacles as compared to a little preload on a stiffer spring being plusher and no bottom on g-out. It has everything to do with overcoming the force that the preload stores in the spring.
Without any empirical data it is difficult to "guess" at a change that improves the situation. But if the stock spring is 950lbs and has a 1/2" or more of preload on the minimum setting, then I think that the ride would improve with a 1000lb spring and 5mm of preload. This is for a 220lb rider. A lighter rider might could use a 950lb spring. It doesn't appear, from the dissatisfaction of the elka spring (ride) sag measurements that much data was done to gather slope information on the rear suspension. So a bunch of spring swapping is going on.
Rule of thumb on the rider sag is 30% of wheel travel. Especially on a long travel suspension like the "V". So a reasonable setup would be around 45mm of rider sag and 5 to 10mm of free sag. This should net you about 10mm of compression (preload) on the spring.