I agree you're doing something right to have such a high percentage to have taken their first meal. At this point I don't think you have anything to worry about. With the clutches I've had so far, it seems I get about 90% to eat a live hopper the first offering at a week after first shed and then the rest have taken their first meal on the second or third attempt with doing nothing different but giving them some extra time to get hungry and all of mine have figured it out by the third try. I would wait 5-7 days and try offering a live hopper again. Good luck.