True, playing it slowly - even if you have good team - may bring much better results. One thing to remember is that Kamihime have 3 day cooldown (so you can't use one in the same day and two next), but you don't neccessarily have to do tower everyday (a lot people are doing it at days 2, 5 and 8, you have all Kamihime to choose from then).
I also recommend doing something similar to this:
While I did messed up anyway, I can safely say that this helped me a lot.