If you're looking for a moderate Dragontail route I'd advocate for the Gerber-Sink north face, overall far more entertaining than Serpentine. I think we did the Hidden Couloir finish (across the ledge at the base of the fin and across more ribs trending up and right, nice position, decent rock, and entertaining climbing. You could easily do the Fin finish as well.
NE Buttress is a great long moderate adventure as well, but the guidebook info over there is vague when it isn't completely wrong.