This is cool to see the comparison of the different level chests.
At 40,000 power I decided to split it between 2 accounts as well and aim for 12 chest at each account rather than 15 for one account. That being said one account got 4 cards out of 12 chest :( But you have taken this to a whole new level.
Thank you for sharing!
Ya, it definitely seems like the lower rating the better, if you're trying to stretch your power out... but much of the time it also seems to work out to almost the same number of chests either way.