[Joe K]

Try setting up a gravity feed to your carb. Yunno. Sort of like the "temporary" tanks that people make out of lawnmower gas tanks and attached to a temporary firewall - so they can go out and test drive the chassis?

Watch your windage though. Whatever you set up has to be wind resistant so you don't create an accident.

If the problem goes away perhaps turning down isn't addressing the issue?

And if the problem remains - then you know where NOT to look.

Joe K