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I have a pro systems carb that does the same thing.
It came with extentions & whistles, I've had the floats up & down without any noticeable difference. I now accept that I just have to blip the throttle when it occurs.
It is definately a sloshing problem & cleans instantly when the throttle is blipped.
I have noticed that the whistles do not seal very well in the jet blocks & considering sealing them with epoxy. at this point I am not sure the problem is serious enough to warrant it.
Please let me know if you find a solution.

Craig