If by stay lowered you mean you want to use your height switch and have it not rise up at applicable speed, I think you are in for a losing battle.

You can set a lower static ride height, by which "normal" can be somewhat lower, and it'll happily do that and still go up and down via your switch (just a net change from that reference point).

You don't want to get real aggressive on that in any case as you can damage your bags going too far into low rider territory and then wailing around. What's safe? Dunno. Wasn't willing to be the guy who learned that first hand.

You will also find your ride characteristics will change, and not n the soft and squishy way. When you run lower, the air volume in the bags is less. When you tag a bump, the suspension compresses and the air volume in the bag decreases. In a lowered status, the amount of that additional decreased volume from the bump is a greater proportion of the static volume than it would be at normal height. The result is an increase in the rising rate compared to normal. You will be able to feel that. That may be ok, just mentioning.