Peppermint and cinnamon flavors can hid a myriad of problems with a flavor you don't like but I had too much cinnamon early in my
vaping experience and don't use it any longer.
For the flavors that don't sound like they'd go well with one of those, I used to use vanilla custard, butter cream or Bavarian cream, but Deej, in his continuing efforts to get us only the safest and best, doesn't carry either of those. For mellowing out a fruit taffy, I'd bet Pear or Apple Taffy would also work well (they are very light.) For a PB&J, if you have a second one that you love, a few drops would probably probably counteract any perfume taste.
P.S. TVT is also good mixed with any fruit taffy (especially banana) in a higher ratio -- like adding vanilla to a smoothie.