One small mouse every 5-7 days is probably not enough. My girl who is about 386g is just starting on small weaned rats which I pre kill. The only time she ate mice was when she was at Petsmart. Soon as I got her home, I offered her a live fuzzy rat after 2 days and she snapped that up like a candy bar. Since then it went from fuzzy rats to rat pups and now to weaned rats. At 169g you should be able to feed either large mice or rat pups. Really depends on the vendor and how they size/weigh their feeders and categorize them. But you want to feed about 10-15% of the snakes weight so a 17-25g mice or rats. I would personally try and switch him to rats so it will be more cost effective once he gets big. Otherwise you will be feeding multiple mice per feeding vs just a small rat per feeding.