Black Fleet Crisis was from 16-17 ABY, yeah.
Also, I feel like the primary reason Exar actually defeated Luke was due to Luke already being sent reeling on the floor by Kyp Durron and of course attacking him with a spell he had no defense against.
Granted, he could use that spell again, though I'm not sure if it'll be for a majority. Luke's more practical Force abilities -- particularly TK and Barrier feats -- are superior to Kun's..