Super Dance Lesson and Normal Dance Lesson gave me more or less the same rate of increase with Perfect+Bonus gauge, the reporter, AND the Dancing mood thing. So I'm not sure in your case if it's just the numbers lining up or what. Which week were the lessons done on?
My memory could be a bit fuzzy, but I know for a fact I skipped Lv. 4 entirely, and I'm almost positive I did it with a super lesson. I had the lesson reporter, and... two people humming, I think.
Thing is, I think... I've done the reporter/humming combo before on regular lessons, and not gone up a level immediately (can't remember). I may try today if I think it's worth it and if all those factors line up, but if you ever get three people humming/dancing/sparkling with a reporter, do a regular lesson, nail every norma without mistakes, and -don't- gain a level... then by definition, super lessons must give more.
This happened really early game, right after I released my first song (can't remember if it was the same week or if I hit another audition or something afterwards). I popped the reporter (on luck, totally didn't check) and immediately hit the lessons.
EDIT: Just did three people humming, reporter, Lv. 13. No miss clear, maxed + 2 norma. No level gain. Maybe earlier levels are easier to gain?
I have actually been manually doing 歌姫 festivals and one thing I've noticed is that your opponent will almost always memory appeal constantly once you've hit a certain score. I can't even win with the Sugamo amulet.
If that score is always the same, you think it's possible to creep up to that score towards the end of the Fest, then drop the bomb? And do they get more than three?
Also, if you go one-for-one on Memory Appeals, I think both sides still get net gain? Can the computer Memory Appeal faster than you (if you're aiming for Perfect Memory Appeals)?
For what it's worth, I think the one in the Southern area (Fukuoka/Kyuushuu)... happened around 13000 - 14000?