EDIT: You may be thinking of TOV 5, not 6, that is the one with the BRUTAL ED-209 walkers
With a fully leveled up Sycthe, those guys aren't THAT much trouble, its the bastards with the rocket launchers that are driving me nuts.
I'm playing on warrior, BTW.
If I try and chuck explosive shrunkiens, they auto target the walkers cuz they are closer
I use the fire ninpo, because it takes out more targets.
I have a 1 herb, 1 grains, and one Life of the Gods, but I'm trying to save the LOTG for the boss.