Yeah, i still haven't finished all of the ex episodes. Holidays and Guild Wars 2 were "in the way", but i'm slowly working on it. But as soon as i have to pad to meet the season goals (so when it requires 8 concerts, auditions or festivals), i'll probably wait for eDEN before continuing.
While you are right about the idol order, i think another song would have had more influence. I use Cosmos Kosmos when i want to score as high as possible with a visual trio unit. And then there is the outfit.
But yeah, the S2 and S1 rank up festivals are hard and i usually sacrifice the second song as well. My strategy for S1 is to counter with Yukiho, Haruka or Makoto twice and then burst with Miki, Chihaya or Hibiki at the end of the song. This usually works quite well. So far i have won 2-0 twice: One was the very first time, using Yukiho as leader, and the second time basically came as a surprise.
I never noticed that the opponent is Mai, it makes a lot of sense though: She is considered a legendary idol, and she uses the same burst skill as Ai at some earlier rank up festival (C3 or something like that iirc). It somehow makes me feel all fuzzy inside :p
With some idols (ARGH, RITSUKO YOU SUCK AT SOLO FESTIVALS!) i really had trouble beating Leon at the end of ex episode 3, even with 4 memory appeals, S1 rank and lvl 45.
I'm also still waiting for an S1 all star festival, i recently completed the requirements for S2 after 2 songs...
What do you want to verify and what help do you need to do so? I'm also thinking about doing some more stuff after getting everyone to 50, maybe getting Takane and Miki to 5 memory appeals (i got Yukiho, Azusa and Chihaya already, the rest is on 4)