I haven't owned such a combo, but I've ridden in, and driven some.
These were well tuned combos, they both were somewhat "sloppy" at part throttle...motor wanted to load up a bit and stumble under light throttle. One was a modified 1250, one was a box stock 9375 3 circuit Dominator. I'm sure a carb guy could clean up part throttle though. My friend running the 9375 will pull some jet out of the primary side when doing a lot of street running, that definitely helps clean up part throttle. My guess is that a carb guy could restrict the intermediate fuel channel to help things out without effecting WOT, but that's just a guess by a guy that knows just enough to be dangerous...but has very little practical knowledge of actually modifying carbs.
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