Honestly, at this point just revert the nerfs, keep the few buffs you gave him, and be done with it. Dante feels bad to play right now, and it's not just because the line of sight on Tragedy is broken. (Will the fixed version even hit enemies behind him?) People were enjoying a cool new frame that JUST released and didn't need three buff patches to be good like some previous ones. He wasn't Saryn or Mesa tier, let alone on Octavia's level. Are we not allowed to get great frames right off the bat anymore?
All you needed to do is let overguard work with damage reliant abilities/mods.