Glad to hear he's on f/t! We both seem to have purchased really good eaters. For whatever it's worth, I switched Gloria over to f/t rat pups when I got her and she's been eating like a champ. She was about 130g when I made the switch. So if you're considering getting Norman onto rats, if he's anything like Gloria, you'll probably have success!
Though finding a steady supply of f/t rat pups in the Pacific NW seems to be a challenge...