If you tried everything with the carbs that you are happy with, try checking the ignition. Good chance its not advancing properly. Also look for vac leaks. Is there a difference betw driving slowly thru the problematic rev range (say 20% throttle), then increasing the power to get thru that range (40, 60 80 and 100%)... if its always in that rev range, with the carbs delivering different amounts of air and fuel, then I would def look at ignition.
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1969 VW aka Suicyde
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