Just give him another light weapon, take out any stealth stuff, leave him just a bard with some light weapon who's not overlapping with anyone who wants to take anything rogue-based.

It's not a power issue. You're taking up multiple character roles as of now.

Edit: Looking at his actual bard skills, I'd... say focus on them a lot more. He can only do some very weak stun and sleep spells and a self-targeting speed boost. His songs should do more then that.