Ah crap... just checked the RS manuals, they've gone and changed the freaking colours for each rating for 2010Socket - I just checked the RS manual.
Yellow spring is aimed at 140-160lbs
Red (stock) is 160-180lbs
Bit confused now, as i'm running the red. Rear spring is fine, correct amount of sag, so maybe RS spring weights are way out on the forks?
Any suggestions?
So assuming (which is the mother of all f**kups haha) that the actual rates are equivalent to the old ones, the Red '10 spring should be ~40lbs/in, the Yellow 35lbs/in. If that's the case (and I suspect it probably is, especially since it's also the same increments Fox use in their forks), with the yellow spring your results would be as I listed above for the "silver" spring since I calculated that with 35lbs/in spring anyway. I think that is most likely the correct spring for you.