I agree with what Indjo said. Feed until they look full but not fat. I'll dig through my pictures and see if I can find one to show for example. It's like.. you know how you feel when you eat a good meal compared when you eat Thanksgiving dinner? The difference between full and STUFFED. You want them to be full.. not stuffed :)
As for the freeze dried vs frozen. The freeze drying process takes away most of the nutrients from the food so is basically candy. If you want to feed it once or twice a week as a treat its fine but not as a normal food and NOT as a conditioning food. I prefer to feed nutritional treats like live white worms and brine shrimp instead of freeze dried foods but to each their own.