I also like a slim body slip float, what I call a river float is similar to those wagglers.
Couple other factors, techniques to consider. Regardless what float you use, make sure you off-set its bouyancy with enough weight. The goal is to put on enough weight so the float barely stays above the surface. I have had them balanced just so that the float actually sinks ever so slowely. When they are that finicky I use 4 pound mono, and #6 aberden hooks. That usually does the trick.
just for clarification, I put the weight about 18" above the hook.
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