Usually when situations like that happen to me I get creative in shifting the flavor profile in a different direction. It's a simpler process when it's DIY vs. premium
juice, since I have the exact recipe.
*Too much nicotine, add extra PG/VG. Possibly add an even ratio of the non-sweetening flavorings.
*Flavor to intense, add extra PG/VG to dilute the concentration.
*Don't like the flavor profile, first throw it in a crock pot for a couple hours to see if that adjusts it more to my liking. If not, I either attempt to overpower the main ingredient/s I'm not liking by adding flavorings, etc, leave it a few weeks/month in my closet and come back to it or if all else fails toss it out. All dependent on batch size.