Your preload spacer should be sized to adjust for proper rider sag. Megadan has a decent post on this somewhere if you search for it.
To stiffen up my front forks on my Hawk I changed out the fork oil for heavier weight and put about 220ml in which is a bit more than I took out of it. I'm happy with it, but I still need to set my sag as I think it's off a bit.
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