Hey, I'm not gettin' hung out here by myself...I think it's pressure side, too!!

The increase with the pump on slipped by me and I probably should've never brought up suction side as a first culprit.

After all that, I can see a remote scenario where it could be a cracked skimmer and I'd check it just cause it's easy to get to with the phenol red.

I agree that pressure check will find your issue...almost assuredly.

Dave S.