Little Piggies! Need feeding advice for White's

[shatrar]

I'm looking for advice on the best way to feed four white's. Here's my story.
Ron and George came home with us on Jan 12, and for the first week I just tossed crickets into their tank and let them hunt on their own. Then we brought home Fred and Charlie the following week and with four frogs I was afraid someone wouldn't get their fair share so I started taking them out one at a time to eat in a separate tub. This quickly became an issue with all of the frogs trying to get out each time we lifted the lid off the tank.
I thought it wouldn't be a problem in their new enclosure, front opening exo-terra. But my guys are not shy at meal time, and when I open the door I have to be ready to catch. I've had 3 of them jump on me at once to be the first to eat! I figured all of this commotion at meal time probably isn't the best for them, and I've been trying to train them to bowl feed. So the first try, Ron had quite the feast before the others figured out where the food was (even after I placed them inside the bowl...). It only took a few days for them all to get in the habit of where the food was, and to wait in the bowl rather than on the glass.
But new problem, Charlie is extremely aggressive and violently tried to eat Fred (they are the same size). He actually tried to eat my finger once, and swallowed it down past the first knuckle before I could gently get him off (thank goodness they don't have teeth!) So now I'm back to one at a time outside the tank. They actually don't seem to mind coming out of the tank to eat, and it is easier to monitor who's eating what and calcium/vitamins, etc. The only thing I don't like about it is trying to corral them all when I open the door.
I feed them around the same time each night, and wait for them all to wake up first.
Any suggestions?
Also recently switched from crickets to dubia, and I'm feeding them about 4 each every night. Is that too much? Not enough?
clockwise from back left are Charlie, Fred, George and Ron. This was before the violent attack.
Bellies! Left to right; Ron, Charlie, Fred and George waiting impatiently for dinner.