I had another thought...only put a few crickets in the bowl at a time, line the bottom of the cricket bowl with a dry pt, so they don't drown, and when he/she is in the bowl eating keep adding a few crickets at a time. At that size, which is basically the size 3 of my small ones are now, they only eat between 1 and 5 1/4" or less crickets in a day, but can eat dozens of ff's. Try only putting in 5-10 crickets daily or 3-5 in am and 3-5 in in the pm. Maybe this will help. Best of luck I know it's really frustrating.
Here are a few pics of Baby when I first took him/her in and Baby now with Mr./Miss Hoppy. They are still very small, but doing very well.