feeding every 4-5days when they are younger is normal, i would doubt that he would shoot out and latch on to you, because if he did do this he would realize you are not food and would release, just try opening the lid from the cage much slower and not fast!

If it does become a problem, just do not pre-scent the room like you are doing, if you don't want to pre-scent... defrost/thaw and warm up in a completely different room then just bring the prey in ready to feed because your ball will not be expecting a meal.. but i think pre-scenting is great