I duoed it, took 2 tries.
Posted strat on wiki kill the eyes first & nin get steps for stunning the Teir 3 -ga, then go from there.
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I solo'd like 80% of the Wotg fights as Smn and that was pre 90. The Sandy Route is by far the easiest route to go for soloing.
Update in case anyone is interested I finally completed the fight with a group. Thank You if any of them read this.
Grats.
On a side note, I'm doing Sandy missions at the moment (because of 2 reasons, one being that the final fight for Basty missions really suck, and most of my linkshell did Sandy part of WotG when they finished the storyline) and so far, I find that storyline to be soloable by a SMN. I think you can go as far as Blood of Heroes before you need any help, and even then, from one more SMN.
Congratulations Neonii! I was stuck at that mission for quite a bit myself. I finished WotG last week myself. I was just about where you were and I solo'ed/duo'ed the rest of the missions and quests in just a couple of days. Some of the missions are going to require at least one other person, but you can safely do the Windurst quests on your own I believe. I used RDM to solo the Windy quests and WHM for the fights where you have help. I think SMN will work well for some battlefields, but might be tough for others. Keep us updated on your progress :)
PS
As a SMN, the Windy storyline was incredibly inspiring and entertaining! :D