My females are always ravenous. I obviously don't feed them as much as they want because of reproductive obesity issues, I do occasionally give them bean beetles. They aren't low cal but they are tiny so 6-8 of them keep them busier longer than one dubia nymph. It's really more enrichment than diet food.
I'm sure you are avoiding things like wax worms and other fatty feeders.
You could try smaller things that move around a lot; my female loves zooming around to tag fruit flies and newly hatched mantis ? They're small enough that 10-15 don't count for much, if anything