Saw a bug report on the US forums concerning this, apparently the 2,000 strength from Blessing of the Ashbringer isn't scaling down in timewalking (much like the order hall set proc before it).
That's exactly the issue, I get 510 STR without Blessing of the Ashbringer, then it shoots up to 2,610 STR with it active. Queue as tank or heals (doesn't matter) and Divine Storm all of the things.
Queued as a tank, my group somehow fell behind, pretty sure it was the healers fault, but I was wrecking everything solo in Arc until the kicked me. It's kinda nice, I always miss out on the fun bugs.