OK, got back to this one yesterday.
Sorry Tom, forgot the vacuum gauge.
What I did do was swap back to the stock cam from the A-11, thinking something may have changed in the valve timing after my "donut". (last time it ran correctly)
I also found a huge exhaust leak at the slip on muffler and header pipe connection.
Sealed up the leak, swapped cam and didn't change anything else.
It sucked the filter dry after the first lap, wasn't really pushing it hard either. (warm up)
Just like in the video, if you pull the filter down in such a way to allow the trapped air to exit into the fuel tank, it will fill up the fuel filter. So i did that, and it never really emptied it again. Maybe went as low as 3/4 of the way full.
Made about 6 more laps, but it never went dry again. This is weird.......
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