4th job Single Target DPS

I was curious so I fiddled around with the Aran numbers on java.
Tentative results gives
15904958 Damage / 51.45s
309134 DPS
1878.6%/s for those curious; a fluctuation is given by the changing WA though so you would need a function to define that first before multiplying by range, otherwise it would be an estimation
We are, however, limited by the damage cap on all four hits of Tempest; all four will always break 200k apparently, so we end with:
301064 DPS
What's interesting to note, however, is with these stats, you'll have better DPS if you were to continue past 215 Combo, or 255 if the damage cap did not exist. Consequently, it would continue to climb as time progressed, towards the number listed in the spreadsheet.

Conditions were:
Same stats as the spreadsheet
No Final Blow (turns out it was lowering DPS in all circumstances with SE and Critical Ring) (@600ms)
Combo Tempest @ 200 Combo
Combo Tempest @ 2250ms
Combo Ability gave its +WA bonus as combo was built up, as well as Combo Critical's damage
Rounded min and max in damage range to nearest whole number
In the instance of transitioning from X9 to X0 Combo on Double or Triple Swing, the second hit did not gain the bonus from Combo Ability and Combo Critical

That is to say, Double and Triple do two hits; if the "first" hit gives you enough Combo to bring you to a new level of Ability or Critical, the "second" hit did not benefit from this. I don't believe there's any evidence to argue otherwise, but feel free to go test it live. I might if I have time. Logic behind this is that they are simultaneous, thus use the same range as when they occurred, though this could be vastly different on multiple mobs.

In the case of Thorns, provided both Thorns and SE can be active at the same time and the game will choose which will be in effect given Combo Critical's changing activation rate:
15964225/51.45
310286 DPS
where Thorns is active for Combo < 30 (Combo Critical Rate @ 30 is 40%, canceling Thorns' Effect, assuming Critical Ring doesn't affect this occurrence)
The damage cap lowers this to 302214 however.
Thus, not a particularly significant bonus, but if you're given the situation where your Combo won't develop quickly past 30 often, it should be a better option.

Just a little more realistic insight towards Arans.