Tactics for Safe Simul-Climbing
Using modern equipment to protect simultaneous movement
The leader has the relatively easy side of things - they lead in a normal manner, but just don't stop at the belay anchors! They primarily deal with extra gear weight due to the long simul-pitches.
The leader racked up with PCPs on dedicated lockers, with many cams and draws (racking in "stacks" helps with gear loop space).
PCP placed at anchor bolt. Draw is optional to back up PCP - when loaded cleanly, most PCPs are rated to hold around 15kN in "Pulley Mode", though a leader fall onto the device risks low load failure if the sideplates bind on the biner gate and crossload.
The follower has the more difficult job of matching the leader's pace and ensuring PCPs are in place where needed. Following on top rope with dangling devices and constant slack can take some getting used to.
The follower's setup - a small droop above the GriGri, a 10-15 foot cache loop, a back up knot to the belay loop, and a dangling tail with no knots.