Increase size of rat for a yearling?

[Bogertophis]

Are you feeding F/T or live?

I usually say go a little smaller if feeding live for the snakes safety.

If feeding F/T definitely small rats (60-90G) are okay now. More nutritious than weanlings. However, I would feed every 10-14 days once on small rats.

I agree- hopefully feeding f/t. And it's better (healthier) to underfeed slightly than to overfeed slightly- so when in doubt, lengthening the interval between meals is a good way to go.

And...feeding snakes doesn't have to be such an "exact science" at every feeding anyway. They sure don't eat on schedule in the wild, nor is it essential for captive pets or breeders.