Checked right now some of my trinkets; tooltip damage scales depending on my versa and mastery, thus leaving only crit and RNG-mastery out of equation. But I've got 18 crit and 44 mastery (i.e., +18 and +22, tops), and not that many DPS-procs (Concordance, neck-ench), thus leaving me with question - how comes I ever see crits for 1.7 mil?)
820k * 1.18 * 1.22 = 1.18 mil. If we consider adding versa (5 percent), we'll have 1.24 mil. It's closer to the goal, but still isn't close enough.
Although 820k (base damage x2 for crit) * 1.18 * 1.22 * 1.05 * rnd(1.00-1.22) gives us range between 1.240 and 1.513 mil. Closer to being true, but doesn't explain tooltip changes with trinket-swap.