Well, unfortunately you can't always get them to eat new insects you introduce. I tried Phoenix worms last fall, none of my 13 leos would touch them and I tried for over a month. Out of my 13 leos, I have 3 that refuse to eat Silkworms, they would rather starve to death LOL And I have 2 that won't touch mealworms !! Picky critters sometimes, I swear LOL
One thing you can try, I don't know your feeding schedule, but let your Leo go an extra day or 2 between feedings so it's really hungry, then introduce the new feeder insects and see what happens. I've had that work, but of course, not always 
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