I don't believe i would use Dynex Dux inside a roller furling foil unless the foil was supplied with fixed bearings to keep the foil off the Dynex. I have been torturing a length of 9mm for the last year testing elongation, creep and abrasion. This stuff is incredibly tough but the yarns are made up of incredibly small fibers that can get a little fuzzy with enough abrasion. An aluminum foil rubbing around it every day in places where you can't see it would make me a little wary.
OTHO, on the backstay antenna, I stuffed a piece of 16 gauge bare tinned and braided copper inside my victim and pulled it to 60% of MBL and it stood up fine. It does increase the angle of the lay which theoretically increases the load on the yarns but bare 16 gauge is about the same size as a yarn of 9mm and there is one of those at the end of the taper of both splices so I am not so sure that it making a stress riser point is much to worry about. You really need to size Dynex Dux to no more than 12-15% of MBL to keep the creep in check so a few percent loss in breaking strength should not be noticeable.
A few other things: This rope is so stiff that running 23' of wire up inside it would be a real PITA. I would use annealed copper because when you pull it to reset the yarns it is going to grab the wire long before it completely stretches out. There is a good chance that the hard temper copper sold for Ham antennas would get pulled apart. Lastly be sure to run the wire in and tension the line to at least 2,000 pounds before cutting and putting in the second splice. The wire is going to considerably shorten the length.
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