O10 is something special because there is a lot of downtime + there is an add that does not affect boss at all.

At first I did my normal rotation until add and then used bahamut right when the add phase started. This leads to a lot of DPS on the add but won't help with the boss at all.
In addition: If the add dies to fast, we won't be able to burn our bahamut trance, so we have Aetherflow rdy and can't use it.
If the add dies slower we are able to use the bahamut trance but most time we still will have to use deathflare early.

In the end I came up with using bahamut earlier (after ice), so a bit more dps on boss and less dps on add. Unfortunately this bahamut will not do all wyrmwaves due to missing Aetherstacks.

Then use bahamut trance, so I can use Aetherflow right before the add dies.

Now the tricky part:
When boss lands and we can do dps Aetherflow will be rdy again. So what will be better here: Use bahamut trance for the full duration and start bahamut later or "skip" bahamut trance to use bahamut right after?

If we get Aetherflow on CD fast enough, next Aetherflow will get ready at some time when orbs explode. So squeeze out 3 Fester and then instantly start Bahamut Trance again to get Deathflare out before Boss disappears again.

Is this the best we can do to optimize dps on the boss? Or is there some better handling?