In the Zero mission where you have to retrieve the AFOS's head, after you have the head do most of you just try to get back to the south end of the canyon as quickly as possible without stopping to destroy the enemies?
Or, when you encounter an enemy, do you drop the head destroy the enemy and then pick up the head again?
I've been ignoring the enemies and just getting back to the south end of the canyon as quickly as possible. I've found if I stay in Gerwalk, hug the canyon walls and jink a lot to avoid missiles, I can get back with just over 3 minutes and most of my health left. Still, best grade I've got is a B.
Haven't tried this mission using the booster yet.
Graham