Paul,
To offer you some sincere support - try this: Whenever you take the needle valve out of the spraybar and replace it, stick some clean fuel tubing on the spraybar and try to draw air through it. You will, at least, be rich enough when the restriction allows you to draw air, not freely, but without popping your eardrums.
After you run the engine and dial in a nice setting, try it again, to get an idea of how much restriction you should feel next time. (At least, this extra step forces you to get the needle open about enough...)