I just wanted to chime in to continue offering food and if he does not eat, to not worry about it. A surprising number of snakes will continue to eat even when undergoing treatment if their cage conditions are suitable; sounds like you have husbandry dialed back in and that the snake is showing you he is definitely ready to eat.

You did not note the size of your snake; 10 grams of weight loss is not much for most snakes older than a few months. For your own knowledge in the future, a) 3 months of non feeding is okay if the snake is choosing not to eat (ie stressful treatments, not that the owner doesn't feel like getting rodents for 3 months), and b) weight loss/fluctuation is normal, and not really worrisome unless the snake is losing more than 1/3 of its body weight or you can clearly see the spine sticking up and the snake starts to look triangular in cross section.

Sounds like you have everything dialed in now though, and good to go.

-Jen