Im not sure if this will work for you Jimmy but you could try putting his crix in a tub then putting them in his viv, if you use a tub like the pic below (maybe you should try a smaller tub due to the size of your beardie) you should have no escape of crix, thats how i feed my beardie, when i put him in the bigger tank he seemed a bit scared of the amount of space the crix had too run, if there isn't alot of things in your viv try taking everything out when its time too feed.
In regards to the Waxworms they are full of fat and should only be used as a treat not a staple, too many can cause problems, try the phoenix worms or silkworms both very good staples, you should see a big difference in his eating and he might go back to crickets like my beardie.
I wasn't against the Reptiglo either, it seemed fine to start with but after a couple of month he seemed very lethargic and not eating very well, i would change and save taking the chance, he wasn't right for weeks until i got the Phoenix worms and the Arcadie 6%.
One more point i picked up along the way, it takes half an hour for beardes to reach the required temperature to get them active and ready to hunt food and an hour to cool down, i always put my beardie on the baskin spot for half an hour before i feed him and he always seems keen after that time.
Good Luck
Tam