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Stefan,
Our KC 427 FE engines are almost identical from what I recall, and I was running the F15 emulsion tube and also experienced some of that hesitation and stumbling at cruise which was driving me crazy. A/F ratios were in the high 13's and I though everything was good, since it accelerated like a striped ape.
But like Rick said, it's the E-tubes that get the fuel to cylinders through the mains at cruise/steady state. Go back to your F11's or a tube you've used before in the same family. My gurgle and hesitation at cruise speeds (3,000 to 4,000 rpm) pretty much went away with the F11. I'm running 145 mains with 120 correctors. Had too much popping with the 200 correctors. Give it a try.
Tom
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