I would suggest you buy some rubber electrical self vulcanizing splicing tape. It does not use adhesive. It is available in almost all hardware stores. Wrap a couple of wraps around the seat tube, then install the strap. Ultimate no slip grip. It leaves no residue and is very easy to remove. I make my own frame bags and have used this stuff to line my straps (with contact cement) so the bags do not slide around, and slowly wear the paint. With this fix, your Two Fish will not twist or settle. I used to use a liquid rubber to smear into the surface of the webbing on my pump strap design. You could try that too. Of course frame and strap should be clean when installing.
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