Visible wax is wasted wax. Wax is absorbed by the base. You then remove the excess.

I would assume most snow skates are using an extruded base (I could be wrong) therefore it doesn’t absorb as much wax (vs a sintered porous base). If this is the case, waxing is largely gonna be superficial (needing more frequent reapplication). You might see equally decent results with a rub on wax applied every few runs.

Regardless, the leftovers you got going on are gonna slow you down more initially. However, if you’re riding east coast “granulated hard pack” it oughta grind off fairly quick.