Hmmm...
it seems obvious on the surface that their is an airline clog in the venturi line or valve...
It sounds like you've thoroughly checked this out though...
I know on almost all the venturi skimmers I've used I just pop the air intake valve off as they clog up too easily/frequenly...
I also replace the Venturi line (if the skimmer design allows for it) a few times a year....
If the pump is working fine and pulling water no problem, the issue should be within the venturi valve or line itself...
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