Quick update, I finally found the skimmer not producing any bubbles yesterday and couldn't get it to restart. Usually if I had to switch the pump off I just had to blow into the airline to get it to restart but not this time.
I took apart the pump and the fishing line had worked its way loose. Soo .. I'm thinking, fishing line isn't a good way to attach the mesh.
I reattached the 3 layers using 2 zap straps and trimmed the mesh a little. Restarts on its own now, so that's good.
Since I had it apart anyhow, I decided to drill out the venturi a little. Wow, just one drillbit size up from the one that fit into the hole already and I can tell it's pulling way more air. Unfortunately I lent out my airmeter so I can't tell how much more but I wish I had done this weeks ago, it looks like it's skimming even better now.