A little over a foot long doesn't seem very big for a dragon who is a year old...my dragon was about 16" or more at that age.
Best thing to do is get rid of the mealworms, they are not worth it for bearded dragons, especially when they are older. By a year old, one feeding of insects and salad all day is good...till they are about 14 months old, then they should have about 80-90% greens, daily. Typically after they reach 18 months, dragons will not eat as much, even skipping days, so they eat every other day instead of every day...but this depends on individual dragon and the sex of the dragon. With mine I found she just had a lackluster appetite if I feed her every day...but if I feed every other day she will eat her entire salad and worms, so i adjusted my feeding schedule to suit her...she will eat more when she's producing clutches and I also up her calcium dustings during this time too.
Good insect foods to use, besides crickets, are superworms, butterworms, silkworms, hornworms and various species of roaches.
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PHLdyPayne