If the idle mixture is sloppy rich, backed out 4 turns, the engine can be run rich to lean at WOT. Try setting the idle mixture from sloppy rich to a normal setting and the idle needle protrudes into the spraybar at least .5mm or more which negates the main needle setting grossly as the engine goes lean and no amount of richening the main needle cures the lean condition. It's very obvious the idle needle is obstructing fuel flow at WOT when set to the proper setting or even slightly rich of the proper setting. Clearly there is a problem that cannot be fixed with simple needle adjustments. That's a fact.