The damage boost is damn near nonexistent at current level. But when the alternatives for those last couple slots are non heroic stats or attack power augs that don't work past the cap, it's what you take
How long do you guys think it would take to parse the smallest skill damage aug at the target dummy until the results are outside of the range of margin of error? My guess is two weeks. Edit: sorry I meant parsed with your gear on.
Unless you have literally nothing better to do with your time/life, I wouldn't spend the effort to do SoD progression needed to unlock these augs. If you already have them, great, put them in empty slots that wouldn't have anything otherwise. If you're looking for stuff to continue advancing your character, these are not going to give you the sort of improvement that you might be expecting.