No - let him eat his fill , he's a rapidly growing boy and needs lots of high quality insect protein and dietary calcium to grow big and strong.
You could add medium sized silkworms (about 2cm - 3cm long) to his daily diet , they are fabulous feeder insect. Also try mulberry leafs , endive greens , dandelion flowers and greens, nasturtium leafs and flowers, chinese cabbage (ie buk choy greens - all mine love their buk choy and pick it out from amongst the grated carrot first).
If you can't find silkworms as lavae or cocoons, they are readily available year round as eggs from silkworm breeders , and easy to rear on either mulberry leafs (if you can find them) or on silkworm chow, only need is to control the temperature and keep the humidity levels low and to keep them in a clear box and feed at least once a day once the get big enough to chew through leafs on time.
Only changes I'd make since you are feeding in the tank:
1) is to simplify the tank (remove most the furniture for now to restrict the crickets' opportunities to hide (from you and King)
2) and leave some grated carrot and green leafy salad In there overnight so the crickets have a food source - will draw them out , King can then catch and eat them , and they will eat the moist grated carrot and leafy greens rather than nibbling on King overnight, King can also midnight raid too - yes they do get up late at night if they are warm enough and graze on the salad if it's there and still "edible".).
3) I wouldn't let crickets stay longer than 24 hours and certainly would not leave poos or dead / dying crickets in the tank either.
4) I'd remove any fake greenery , I had some on my grottos and saw Peppa trying to eat the fake greenery (Rex, Puff , George and Mildred have never as far as I'm aware tried eating the fake greenery on their grottos (all got the same kind) , only ever interested in the greenery at shedding time to scratch and rub on), so better safe than sorry and I removed the grottos and removed the fake greeny glued to them (all of them), problem solved and on risk of impaction eliminated.
I remove all furnature and remove all surviving insects in Toothless' and Peppa's rearing tubs first thing each morning, try to handfeed a few crickets to each - bonding / trust building - and then add at least a dozen small ( about 25D old to 1/3 sized) crickets to each tub at brekky am, and about 2pm the salad and greens go in, and if I see no crickets running about at 4pm, more crickets go into each tub.
My lights are programmed to switch on at 6am and off at 10pm now. So the tubs are nice and warm and Peppa and Toothless awake and basking when get up. I also provide heat o/night via a 7W heatpad (simple non-adhesive film type , sandwiched between 2 layers of ceramic wall tiles , controlled and set to stay at 36-37 oC) in each of their tubs. So Peppa and Toothless have a nice warm place to sleep at night , they didn't take long to discover the heatslabs, and now love them.
If I was handfeeding only or could get Toothless and Peppa to eat their crickets in a separate feeding tub - I'd be given 3 feeds of live insects per day each their (and King's) age (as many as they'd eat in 20 - 30 mins each session), but Toothless and Peppa are stubburn and refused to eat in a separate tub and it's not with stressing them unduely IMO.
