This log right here, this is what's wrong.
Above one tank by only 1.2k DPS, losing to the other by 17k... Regardless of it happening that bad on only one fight that is absolutely, 100%, unacceptable.
I don't understand how Ret (and every other spec that is barely ahead of, and sometimes behind tanks, there are a couple others) can warrant a raid spot when shit like that is happening.