I'm pretty sure using the realistic mode in Psycho's revive doesn't do the 50/50 and kill you at 100%, that's the revive guarantee mode.
tcb_ais_revive_guaranty    = true;    // set to true for a 100% revive chance. False, and the unit got a 50/50 chance to fall in agony or die immediately. Attention: Take note of the settings for "tcb_ais_realistic_mode"!
tcb_ais_realistic_mode    = true;    // set to true and units will die if they take a headshot or a heavy explosion nearby. Attention: if set to true, the revive chance guaranty are disabled!
tcb_ais_revive_guaranty    = true;    // set to true for a 100% revive chance. False, and the unit got a 50/50 chance to fall in agony or die immediately. Attention: Take note of the settings for "tcb_ais_realistic_mode"!
tcb_ais_realistic_mode    = true;    // set to true and units will die if they take a headshot or a heavy explosion nearby. Attention: if set to true, the revive chance guaranty are disabled!