What to do with a 3rd head?

[Salty]

PT: Punch Through (when they can acquire your speed)
JTG: Jam to GUN (never recommended except in testing scenarios)
JFG: Jam From Gun
JTK: Jam to Kill where you immediately reduce speed and kill jammers, allowing the lidar unit to get a speed reading (albeit reduced)

Don't forget about KBJ. (Kill before Jam)