I feed Gaia every 2nd day and she usually eats a few Superworms and then like 6-10 Mealworms. Sometimes I give her Crickets but not often because I hate them, and she gets Silkworms and Butterworms when I can get ahold of them.
2 Crickets every couple days is definitely not enough, especially for your big fella! That's probably why his tail looks like it's thinning to me.
Gaia eats that much and when it's feeding time she gets SUPER predatory and starts trying to get to the worms through the glass of the tank when I'm getting them ready, LOL. She has bitten me a couple of times because she was hungry and thought my finger was a worm.
I usually just give her as many as she wants.