ICS stock is around 2.1 on the 05 showa. Racetech suggested 1.76 for MX and I went with a 1.6 FC IC spring. I assume they are very much a like. I did the same with a buddies 05 Honda 450R. 1.6 spring, 350cc oil height, and reshimmed the entire system to a much more compliant fork. I rode the bike a couple of weekends ago and it was very good. I could race that bike just as it is.
Having said all that I am not sure how the CC affects the sag issue. Technically the inner chamber just holds fluid and the rod moves through it. I would think, in a non-mobile state, the fork would sag under the bike and or rider weight in the same fashion as any other until it came in to the spring holding the weight up. Which reminds to bring up the point of spring length. The more coils you have the more there is to move, right?
LOL, this is like tying to figure out how a woman thinks....well much easier. ; )
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