Nope, psycho is the best.
Bio can spam disrupt all they want, but it will be a slow and controlled kill. Although you won't die, it will take some time to whither down his 50k or 90k hp.
Pyscho does about 50k damage in a rather short time, if you do traumatize(drians 15 focus over 2 turns, right?), haunt, traumatize, wait, and then spam debuffs...when he gets to like, 0 focus, just use implosion.
That kills the baron in one hit on easy, and severly injures him on challenging/heroic. Then, you can switch to a normal electric build with shock therapies and such to blast him when he has holy scars on.