I currently run 350lbs on all four corners. The street ride is not overly harsh, but definitely firmer. I may try 400lbs in the near future.

 

Not harsh? Compared to what, a Formula Ford? 350 lb/inch is insane for a street driven car. With the DMS I'd suggest the Prodrive P1 springs, which were designed to work well with V5/6 struts, which should be within the rance of the DMS adjustment, or Tein mediums, although those are progressive.