I just fortified a batch of cherry wine and a black raspberry wine with Everclear. I went to about 21.7% and 21.6% resectively. I'm just going to let them clear out and rack them just to make sure they are nice and clear before bottling.
I just used a basic wine recipe for each, and only added plain sugar to the batches.
On Deck - Crabapple Wine, Delirium Tremens
Primary - Surly Furious clone, Kolsch
Secondary - Hofbrauhaus Lager
Bulk Aging - Brewtopia Barleywine, Pomegranate Wine, Red Table Wine, Wild Fox Grape Wine, Blueberry Wine