I don't think this perk will be changed, but the easiest way is just add Psycho effect if your HP < 50%, which will be stack with real psycho effect.
With afterwipe Psycho, tank build is:
1) BA+x2 toughness+x2 lifegiver+psycho=250 HP and 65% normal DR, so when they will have <= 125 HP, they will have 80% DR +some attributes.
2) Tesla armor+same=45% normal DR, and 60% DR on adrenaline rush.
Edit:
Forgot to take beer into account, if PE isn't neccesary, so it'll be even 85% DR for BA and 65% DR for tesla.