Asdf,
How much splicing are you willing to do? My favorite furling line comes in two parts. The first runs from the drum to the last turning block and is 3/16 amsteel blue. It is way to small to be used by hand, but the small size means it rolls very well on the drum. To this I splice a much larger Tenex single braid as long as needed reach the back of the boat with the sail fully rolled.
It takes some time to make, but it reduces drum problems, and leaves a nice size line to work with.
You could do the same thing easier, but with a lot more expense by tapering something like endurabraid, but you really don't need the extra strength.
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