[Gaz64]

Tom,

Yes, you're correct with the bypass, no numbers and no holes in the side is a 0.00.

You need a wideband O2 data logger to trap the A/F ratio you have at 2000, but by the sounds of it, you have the dreaded Weber gremlin.

Progression hole inaccuracies do not help.

How have you gone with carb balancing, mixture screws (turns out from seated etc)?