Well I've tried alot of mixes over the years, and I still prefer pine rosin. I have used Montana pitch blend with pure beeswax, the toilet ring, and even string wax, textite.
The pine rosin always worked the best for me. I bought 50lbs of wax and pine tar chunks from Terry Henry in Michigan, and that was what he used and sold. The powdered rosin, in pitchers bags works also.
I have also noticed, that depending on the region, the wax came from, can produce a soft wax. I have had pale yellow wax, to very dark, almost brown. My dad bougth some honey and wax from Tennesee once, real dark, and the keepers said it was do to the sorghum fields in the area!
Tim Baker mentions in using tung oil or linseed oil, also as softeners.