I use a 5' + Fluoro leader on braid main line and it's never sunk any topwater ... the difference in specific gravity is not big enough to do that. Something else must have been sinking your top. I even use 20 to 25 lb Flouro and if that was the case my leader would be 2x as heavy as 12 lb. Also, what was your main line? I've never had a problem with mono or braid main lines with Fluoro leader... just not the case. I've fished it like that for years and years and years ... must have been some other factor. That said, the only time you really need a fluoro leader is around heavy oyster, barnacles, or rocks. Other wise 20lb mono will do the job just fine.
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