if theres a trinket that should be nerfed its the Countermeasure, since its a Giga BiS trinket what only can be farmed every 3 months?
I'd argue that it's 15 seconds of mediocre buff; it's 1/3rd of the overall buff for an additional 6 seconds, but Balance wanted it for how potent the buff was, not necessarily due to its length
As for Divine Bell, I would like to see the simmed difference between the current and nerfed versions. Losing 40% percent of the buff, but getting it for 6 more seconds, doesn't seem like it will be a great difference.