Long as you're following the general 10% of weight/widest part of the body rule, there should be no issues. Mine's 610g, on roughly 60g adult mice. "Large" is subjective, each place labels their rodents differently.

What you want to watch for is them losing spine definition. Some spine should still be visible to the eye, but not enough it's giving them a triangle-like body shape. Nor should they be a rolly polly sausage of a snake. But since they may fast during breeding season and go off food at any point (history of being a finicky eater) I'd say let them slam what they want for now. He could be trying to bulk up to go into winter fast and you'll be glad for those extra grams if he happens to go off food again in the future for an extended time.

Worst case, post pics of the animal, laid out and straight as possible, from top, side, and front. With those three any of the regulars should be able to tell you if your snake is looking like he's at a healthy weight.