Mohair, Mo Problems

Godddamn it, not again. Finished the back panel and left front of the Kelly Cardigan from Erika Knight’s Classic Knits. Things are moving along nicely…except I’m noticing that I still have the right front and both fricking sleeves/shoulders to do with only two balls of yarn left. You’re supposed to knit both together – do they mean I’m supposed to double the yarn? It’s absurd that I should only need 6 balls. I’m not using the called-for mohair but yarn almost exactly the same. Urge to kill growing!