So I think I've gotten the hang of it. I got a flawless run and got 604 because I can only do it with Lissa, if I subbed in any of the 1.4x heroes then I wouldn't be able to avoid deaths for all 7 runs.
I then had another perfect run, but surrendered immediately and went to my b team. Weakens the final round of enemies and I could sub in a 1.4x bonus character. Ended up with 631. Not a huge difference. I may just push through with team 1 to make sure I don't have an accident and have to burn a third team for victory.
When I surrendered on last battle my survival automatically dropped to 1.15x (B) from 1.2x (A) which makes sense. My speed also dropped from 1.5x to 1.4x. Again A to B, but I'm not sure if that is automatic or if I just happened to use more turns overall.
Im also really dumb sometimes and get caught. But even when I end up wiping I can make it to the last level and get around 330 points.
One stamina pot so far, 7113 overall score. I can use Nintendo points for 3 more. Hopefully they'll add some as a free bonus, but there will be at least two more from the weekends as well. I'm going to rush to 50,000, then take my time from there, as the additional rewards aren't worth extradordinary effort.
I usually want to spend more time playing. But time flies while I'm running these battles, and I don't even want to imagine the total time invested by the time it's done.