Have you tried "braining" the f/t pinks? Just poke a small hole in the back of the skull and squeeze a bit of goo out, smearing it down towards the nose. Placing the baby snake and food item in a deli cup (w/air holes) also encourages a feeding response.
If this doesn't do the trick, I would try a live pink. If the snake takes it, in time switch over to very warm f/t. If you still have hold outs, then try lizard scenting. Wash the pink mouse, then rub it on a fence lizard or stick a piece of lizard shed to it.
I have found that reluctant feeders sometimes will feed following a car ride. No, I'm not kidding. I take them along to shows about 2 hours away. When they get home, for some reason several reluctant feeders are ready to eat. Go figure.
These are just some thoughts from my experiences with kingsnake babies in general. My favorite mexi black (who was a reluctant feeder as a hatchling), is now well over 3 feet long and takes several rat pups per feeding as an adult.
Best of luck, and let us know how it goes.
regards,
althea