YESSS, i managed it to kill tchort without the mutagen -stuff nor destroying the tanks.
if you are a sniper with the sharpshooter feat then you have luck:
the only important thing: you need armor piercing bullets (w2c rounds, green)
1. shield on, rush to tchort
2. halfway make a aimed shot. -> he looses 80-90% of his health. if not reload and try again.
3. morphine shot+adrenaline shot+rush the rest of the way to him
4. assault rifle bursts (feats full auto+concentrated fire) with w2c ammo until he dies
(was 2 bursts and 3 single shots for me)
time to have a beer.