How warm is the prey you're offering? It should be warm but not hot to the touch and they cool down very fast. By a fuzzy and a pinky do you mean a rat or a mouse? You did good by going in from the top and keeping everything covered so he doesn't see you. I would suggest avoiding the pinky and sticking with the fuzzy, the pinky wont give him enough nutrients compared to the bigger fuzzy. You want to put weight on him but not to much weight in a short amount of time. Since you did assist feed him and he continued to eat it after is a good sign. Give him some more time alone. Go ahead and change out his hides when you can, just leave them in the same places as the ones you had previously. Him being less active during the day is also a good sign. I would keep him on that 5 day feeding schedule until he gets some size on him, then switch to weekly feedings