You have to be careful with bard buffs. He is already on the cusp of being a decent jungler (He already can clear with full health, it's just slow). It would be best to buff some of his utility/reliability instead of raw damage. Considering he is the lowest win rate support, and the second lowest win rate champion in the game, I think he can afford some buffs. For example:
General: The change on PBE where his auto attack range was increased to 550 was nice. Why was that taken away? Many champions that depend on ranged auto attacks have at least standard or higher. Zyra, Lulu, and Sona are good examples.
Passive: You already suggested what I was going to suggest for chimes, so this is fine.
Q: Q is just really slow. Would be nice if it was a little fast, or had a slightly longer range.
W: Late game, the heal isn't very useful since you can't sit around and wait for the full 10 seconds. The W is used more for the speed boost. It would be nice if the max heal timer went down with rank to say 5 seconds instead of staying at 10 the whole game. Or, it would be nice if the speed boost duration or intensity scaled with rank. Also, please make W more visible in brushes.
E: I think E is mostly fine. If anything, you could make it so allies travel faster through the portal at earlier ranks.
R: I think R needs more incentive to put points into it. Right now, I just get one point in R and level it last because the only thing that improves with ranks in the CD and it isn't even by much. R is Bard's true "one point wonder" skill, and I don't think many people have realized it yet...