In regards to one of your original questions, my ATO goes into the return compartment of my sump. Evaporation will always show up in this compartment with the water level dropping there first. If you're pumping top-off water into that skimmer compartment which sounds like it's already restricted by a drain line limitation it could lead to problems raising the water level in that compartment and make it hard to keep your skimmer adjusted.
Is there any mechanism to control the water level in the skimmer compartment? Are you having trouble with this compartment flooding while your return pump goes dry?
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