Haven't studies shown that high stress (like concentration camp) has immediate effect on next generation's DNA? That would indicate that it's at least potentially possible for evolutionary adaptation to work pretty fast.
This is incorrect. Evolution is simply change over generations by natural selection. the mechanism by which that happens, be it DNA or epigenetics or whatever, is not strict
Yes/no... It has to be heritable beyond a single reproductive cycle. Which isn't the case with all epi markers.