There are still things to look at, Paul. Have you checked the fuel flow rate from the needle-and-seat with the float bowl plug removed? That checks the whole system upstream of the needle-and-seat. It should continue to flow a good stream, steadily: run the test for at least half a minute.

If that is OK, check the float height, idle mixture screw setting, and main jet size.

[Linked Image]
[Linked Image]

Does it idle best with the screw set where it should be?

Does the float mechanism operate smoothly with no binding?