I got the best results with a 500 ohm pot for the fuzz control. That said, it isn't worth doing. That fuzz sounds best as is. I plan to take the fuzz out of mine to make room for the LFO mod. I have it wired in and working but all the guts are just hanging out because I've been lazy.
Give a man a match and he'll be warm for a day.
Set a man on fire and he'll be warm for the rest of his life.