Big Questions in SUMMONER Rotation

Hello fellow Adventurers, recently i reached lvl 80 with my main Summoner and with it a clusterf. of question and doubts about the rotation invaded my mind hope some of the most veteran players could help me.

So i was doing some research and i found out i was doing the wrong opener and rotations forever, i used to do this:
https://i.imgur.com/eTy1te4.png

Entering DWS as soon as the fight started together with Aetherpact and weaving spells between a R3 cast, this felt very how i say it optimal in my eyes cuz i ended DWT with just 1 or 2 sec to spare.

But after the research i found out that most people are using this opener:
https://i.imgur.com/Rs8dHsB.jpg

My questions are now, you just cancel DWT with almost 4 seconds to spare? you dont cast a r3 or something else here? just end it sooner?
Also the second stack of Aether Flow when do i weave the second Fester?

Also during Bahamut am i supposed to just Cast R3+r4? should i weave any other spell beside the Bahamut enkindle?

Whats the rotation you guys recommend using DURING Bahamut?

And finally FENix stance... this is the part i have no clue to whats the most efficient way to exploit it, besides the weaving of Enkindle Fenix after summoning him i have no idea of whats the best rotation here, if you guys could give me hand.

I'll give you the link to this site: https://www.akhmorning.com/jobs/smn/.../#good-openers
It's the best caster guide website you'll probably currently find out there. Have fun!

(Your first opener is way outdated btw, that's from last expansion :x)

Yes i did check that page, and i wanted to have a second look at the rotation and have some opinion on other players that actually play the class if they find thats the best rotation or if they have a better one

That's the most optimal rotation for general use, it's designed to align Aetherpact and Bahamut with party buffs.
As for DWT being cut short, there is no use to linger in that phase, you want to go to Bahamut asap, the only reason people don't go Deathflare immediately is because you need some preperation before going into Bahamut.