That would be my assumption. I had a similar problem with C&D Gray Ghost. I mixed it with GLP Abingdon, which I think has too much incense flavor, and not bad at all. I don't like Dark Horse either, but I like Oriental Dusk a lot. I would try adding some Burley and Virginia to Dark Horse for...
GH Kendal Dark in a Savinelli Autograph 4 Freehand, this is one of my absolute favorite tobaccos. No it's not nice out, just using an old picture, still shitty cold and rainy here.
I've made some blends I didn't really care for better with additional Latakia, others with Burley or Kentucky, and others with cigar leaf. Really depends on what I don't like about it in the first place.