If you like the sound, and if it took you awhile to get this sound, I don't believe that I would change the head now. Of course, I always perform with a spare banjo on hand, just in cast something strange and unfixable occurs while I'm onstage. It may be that your fingers have worn through the coating on the mylar, but that there are many, many good hours left on the head itself.
If you're after a particular clunky sort of sound typical of the old-style skin heads, the fiberskin head might be for you; if, however, you like for a banjo to *cut*, to have a sharp sound, you may be sorry if you change. I would advise you wait until you find an opportunity to play a banjo with one of the fiberskin heads, to see if you really want to do that. To me, they seem to be too thick, and I don't care for the muffled sound.
I have found, by the way, that for durability and strength, you can't beat the Five-Star head. I played for twelve years, fifty feature shows a year, without doing any serious damage or causing undue wear on my Five-Star head, and I'm still using it.