The more float, the more the mid valve compression stack can move away from the piston face, the less initial damping you have.
Tight float tends to feel firm and sharp with feedback through the bars; but not necessarily harsh.
Opening it up gives a plusher kind of ride.
But it's just another variable in the whole setup.
However, the mid valve is constantly displacing large volumes of fluid in both directions. Comparatively, the base valve which is a larger piston only has to flow the oil displaced by the damper rod entering the inner chamber/cartridge. As such changes in the mid tend to be more noticeable.
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