"Changing the Strings to a Lighter gauge will/does not change the string height!"
Except when it does Acoustic guitars with flexible tops and necks can end up with lower action when string tension is reduced. The top flattens, and/or relief is reduced. Both will tend to lower the action.
The depth of the nut slots means nothing. Cutting down the rop of the nut reduces the slot depth, but unless you alter the bottom of the slots, action does not change. The proper nut height is the same as the fret tops. Press the string onto the second fret and look for minimal clearance over the first fret. If there is any more than the slightest visible gap, the nut is too high.
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