Get the lube out of the bore.
If that don' t cure it, use that yucky bore butter to fill the hollow cavity on the base of your bullet.

I' m only guessing here because you never did mention what bullet you' re using... for all I know, you could be using a roundball. If you are, drop your grains to 65.

One other note! You should not spit-patch bore buttered bores. Bore butter is not water-soluble/will not absorb water. Whatever your dry patch misses could affect your powder/ignition on following shots.