You should have good luck retaining the carnauba and just making the mixture a softer consistency as I suggested. Take out a spoonful and dissolve in about the same amount again of turps and try it out, I'm sure you'll find it's much more amenable to spreading thinly and smoothly at stage one.
Although you may want to try a mix with less carnauba commercial wax polishes can be as much as a third carnauba so a high amount of it isn't considered too difficult for consumers to deal with. The way they get around the problem is by making the polish a soft paste, cream or liquid.
If you still have trouble, especially on cold metal, you might want to try a slower-evaporating solvent. Or as an alternative, warming the surface the wax is going on. Having a hair dryer handy in the workshop isn't a bad idea anyway for other things like glue-ups in cold weather and to help penetration when doing epoxy fills.
Although you may want to try a mix with less carnauba commercial wax polishes can be as much as a third carnauba so a high amount of it isn't considered too difficult for consumers to deal with. The way they get around the problem is by making the polish a soft paste, cream or liquid.
If you still have trouble, especially on cold metal, you might want to try a slower-evaporating solvent. Or as an alternative, warming the surface the wax is going on. Having a hair dryer handy in the workshop isn't a bad idea anyway for other things like glue-ups in cold weather and to help penetration when doing epoxy fills.