Do you still get the 30% bonus if it isnt corrupted? If you do then is it usually better to just run rare unidentified maps without chiseling if your on a character that can run all affixes? A few weeks ago I didnt even realize you could run unidentified maps that werent corrupted so now I get excited when I get them but im wondering if im better off just scouring them.
Yes. That's what the bonus for running unidentified maps is for - a reward for running the map without seeing what the mods are first by identifying it (it predates corruption being a thing).