Off idle hesitation - solved

1966 Signet
170 slant six
Stromberg WW3 carb
Vacuum is a steady 17
Initial timing 7 degrees
Idling at 750 in neutral
No vacuum leaks I can see
Idle mixture screws adjusted properly
Accelerator pump functioning properly

I’ve tried advancing the timing, I’ve tried adjusting the idle mixture screws, I’ve disconnected the vacuum advance as a test, can’t seem to get rid of this hesitation off idle.

Any ideas? Questions?

IMG_4322.jpeg

IMG_4532.jpeg