1) it's a factor too. Minor but still counts.
I go with at least green condition (85%) and good/very good/superb morale

2) a mix.
You wont use your 4 defenders of 5* with good rates and bench your 7* defenders.

3) If you have AML & AMR, why passing from the middle ?
Better mix
Also maybe you are too furious - lol
Maybe if playing normal, you 'll get a better %
(wrong, a higher, not necessarily a better )