Softer, is not necessarly, the key to Flemish string making, wax!
Tack is! This is why most "twisters" wax, has pine rosin, pitch added, to make sticky! This helps in holding the bundles tight and aid in the grip while twisting.
I have mixed up all sorts of concotions, like parrafin, and the others mentioned! As individual twisters, we have different needs, do to things like sweaty hands, etc.
Over time, I personally, have come to prefer the waxes like what Brownell, and BCY use during the manuf. process. Clear, which doesn't discolor the lighter colors, like bees wax. They have the necessary tack, I desire, and without all the mess of melting my own!
Still use the bees wax mix if needed, and yes it is natural, and pleasant smelling!
So Kat, I would say, try all and any, you will find what works for ya! Happy twisting!