I can't see any weight saving advantage in not using any backing on the reel, we only talking 3 or 4 ounces at most ! Finding a way to secure foam padding to the reel arbor sounds like a lot of work for not much gain ? I used left over Dacron as backing and 100 yard of Gamma 4lb Co-polymer line and it works great for me, I also use the Bentley Tungsten jigs so I don't have any line coil issues, just my .02, Good luck.