If I remember the thread pitch is 1mm, so 1mm preload change for each turn. Forget about where it is set now. Back it off completely and start at 8-9mm measured preload. Ride it. Increase preload until it steers right and doesn't feel like a chopper. If your over 10 - 12mm or the rear gets harsh you should go to a 5.4 spring. I'm a 190 lb "B" and I run a 5.4 and could actually move to a 5.6 for the faster stuff. Sag #s are not so important, as long as it steers. The rear performs best in the trash with as little preload as needed.
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