Still hesitates off throttle...

How do I check that? The throttle plate and choke are almost vertical. Is there something else I should be looking for?

I'm going to have to make a video and link it. I must be doing something very wrong.
Nope, 2 vertical blades with the pedal on the floor is good.
Some pics of what We are working on would be nice. :)
What was the float height setting You used?
A low fuel level will delay the mains kicking in.
The "economizer" valve is a notoriously finniky unit, it may be partially obstructed or not moving freely in operation.
I may have missed it but, what is the fuel pressure if checked?
Were there any issues with throttle pressure linkage/adjustments?