Hi Steve - Although I have bought and used about 15 different brands and sizes of Spectra lines, Fusion braid is not an avenue I'd pursue without some sort of impact testing before flight. The reason is that all strands will break if one does. Just like steel leadouts, stranded gives better impact protection, and a solid strand fails catastrophically if it fails at all. I'd be wary of trying fusion in flight because of this. You might want to try a test of dropping a 10 lb or so weight through a series of greater heights, so as to get some data on the failure heights of steel, spectra and fusion. Please post some results if you do it.
One other thing... Please refer to Spectra as Spectra, not UHMWPE. I know the tech jargon makes us sound smart, but a model flyer who goes to Bass Pro or Cabelas to buy line will get spectra if he asks for it. If he asks for UHMWPE, he is not using the language of the fishing tackle business and the clerk will accordingly try to sell him any product he has on hand. The word Spectra or Dyneema will always appear in the fine print on the package of the product we want. If the package does not use these words, then the fibers are some other type. Best, Tom Hampshire