One of the purposes of review audits is to stop robo-reviewers. For the Low Quality Posts queue, I never had an audit where "Recommend Deletion" or "Recommend Close" was the right action. For the audits, "Looks Good" was always the right action. Robo-reviewers will, most likely, just click on the "Looks Good" button without looking at the post, so they will never fail a Low Quality Posts audit, because there are always good posts picked for the audits.
So, my suggestion is: also pick bad posts for the Low Quality Posts audits, where "Recommend Deletion" or "Recommend Close" is the correct action.