Any lubricant on the base or bevel can contaminate the powder charge, especially if your loads are stored in hot weather.
For my purposes, if the loads are fired promptly at the range, I don't worry about the minor lube overflow. For longer term storage, I make sure that each and every bullet base is wiped off before seating.
Your Lyman 450 lubricator/sizer has an adjustment for how deep the bullet goes into the sizer cavity. Try adjusting that, and you should get zero lube on the bevel.
HTH
John