how imortant is fork fluid level?

I went with 110mm on my WP forks on my KTM because that is what my manual says, but everyone says it should be 120mm. What would the difference in feel be? Obviously going with 110mm air gap from top of fluid to the cap is more fluid that 120mm. Will this make is stiffer? Softer? Or something else?

120 is softer and you will feel it

Fluid lever affects the spring rate in the last 1/3 of the travel.  More fluid makes it stiffer and less prone to bottoming.  The trade off is it sometimes increases the midstroke harshness.  Less oil will have the opposite affect.

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