Granted I've moved on from corns, none of mine ever got rats. They always maintained good body structure on mice. Even as adults they got 1 LG adult mouse weekly.
And Django, my King, also gets 1 LG adult weekly. He gets 2 every once in a while, maybe every 5th or 6th feeding. He has had a few small rats, but only because he's a garbage disposal and I had a refusal to use or it was going outside for a neighborhood cat or something. Figured Django should get first dibs. On that feeding schedule Django is still growing and was up to 775 grams when I weighed him last month.
Obviously Kings and corns are different species, but close cousins in the colubrid family.