I would try prey that offers more movement, to induce a better feeding response. I always start with "Hopper" mice, or Small mice. pinkies just never seem to work very well. and the reason is that they are just to boring of prey to trigger a good feeding response.
Also, ull run into stuborn hatchlings... force feeding is a very last resort. ive only had to do this with a hatcling once, and I wouldnt suggest it unless the snake is getting dangerously skinny.
hope this helps, and GL