If you are gonna use worms as the major food item, I suggest you use vitamin supplements atleast in 1 feeding a week. I think, with the size of your snake, you should switch it over to pinky mice, here is how I switched my melanistic eastern garter to pinky mice in just 3 feedings:
Get a nightcrawler
Get a F/T pinky mouse
Rub the nightcrawler all over the pinky's face, make sure to get some of that worm slime on it too
Hold up the pinky, most likely the snake will smell the nightcrawler scent and come up of hiding to get food, it will smell the pinky as if it was a nightcrawler and it will most likely grab it right from your hand.
You'd have to feed a 17 inch garter snake probably 2 or 3 pinkies a feeding, or 4 or 5 nightcrawlers.
After feeding the snake a few times over a 1 week period, try and feed it without scenting the pinky, it may work it may not.
Michael
Michael's Place
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Michael_Fedzen@hotmail.com