I've been doing this for a while. I'm not sure why everybody is trying to hit the perfect flavor/effect combo with just one strain. I take my cues from making wine where the winemaker will blend different strains of grapes to make the best wine.
One of my favorite blends is Cherry Pie and East Coast Sour Diesel in a 2:1 ratio. Also, this year I started making hash from specific blends of multiple strains. My best hash right now is a mix of Biker Kush, Cherry AK47, Elmer's Glue, Karma's OG, and White Fire OG.
Currently I'm mixing Lilly and Deep Congo. I mix primarily to get a stronger hit but love the flavor varieties. I hope more chime in with how they do this.