I don't know if that's bravery, because most of the time I get hit when enemies have around 30 and 10% of hit. It's alll luck, I've been hit 9s or 5s and criticaled with 1.
Forgot to mention this other habits:
-Try to charge supports as soon as possible. Mostly when the epilogue has paired endings, or just to raise some stats from my units.
-Support characters at maximum (level A, and maybe two Cs, or one B ).
-A bad habit of mine, the arena abuse. Whenever an arena is near, I start fighting in it like crazy. Getting mor money to use it in secret shops.