Imo, a slim snake is a healthy snake; I feed my bp's monthly (though they are both over 3 years, I feed younger snakes more often).While I know this is small, my good girlfriend I got her from only fed her like once a month, so she was a tad behind schedule when I picked her up from her at the end of last summer.
Anyways, sounds like you're set! And yes, you are very fortunate to have such a good eater!