ORIGINAL: Bax
Finally, the midrange can be adjusted by rotating the spraybar a hair. Just loosen the two screws next to the high-speed needle and rotate the spraybar just a tiny bit. Either direction is OK. This will help you get a good transition and midrange.
I wish those sentences were removed.
Doing this does not improve things and may exacerbate transition problems.
The best fix I've ever run accross for ST transition problems is to richen the low speed needle for good transitions and do what is pictured below to adjust the idle... it's worked like a champ on problematic Supertigres.
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However none of this sounds like the original poster's problem... His engine runs just fine until the fuel hits a certain point...