Well, it's a little strange that he's not eating yet, especially since you tried the scenting too, but I guess he's in no hurry. I've never had a new TP that didn't eat quickly, & regularly, but snakes all do have their own personalities.

Trans Pecos rat snakes are strange creatures- they can actually move quite fast when they want to nail prey, but in handling, your observation is the same as mine- that they move slowly & very cautiously & gracefully- as if tiptoeing, which is hard to do without toes. It makes them a real pleasure to handle, and I don't know of any other kind of snake that behaves this way.