Finish getting your GM ascensions to ancient, the difference is massive. As for Feedback Loop: after finishing the cast, the trick is to fit in as many hits as possible. This means that you should check your abilities and set them in an ascending order of casting speed/recovery speed added up together. However, if you have a few exceptional hard hitters, put them first regardless, of course (NO ASCENSIONS as they take too long to cast). As soon as feedback loop ends, start using damaging ascensions, in descending order of damage.