Jet sizing

That’s probably not too big. If it is, it isn’t by much. I’d put it back to exactly stock and tune from there. IIRC that carb has down leg boosters so that jet size for that venturi/throttle blade size is probably pretty close.

Also, I think the MAB is pretty small on those, like .026 or .028 and that’s for a reason. If you go bigger on the MAB to try and correct a high speed rich condition you will screw up the bottom of the fuel curve.

If its fat at cruise, lean out the primary main jet and then if it happens to get lean at WOT tune that with your power valve channel restricters.