The "new" Sandia Guidebook suggests heading straight up from the belay for p3...then working right towards the left facing corner. The original live heads right off the belay to a clean dihedral with two pins. This dihedral ends and heads left via a bomber undercling to a great layback eventually meeting up with the recommended line. Personally i prefer the original line, better pro and solid rock!

Great picture! ... and a great place to begin the 3rd pitch, with the belay at the bottom of the shown dihedral with the fixed pins ... albeit with scant other available pro.