Any tips on getting hatchling corn snakes to eat?

[zaroba]

My corn snakes mated, laid eggs, and 7 weeks ago 4 hatched.

The 4 snakes are all in seperate enclosures, critter carriers with cocofiber bedding and lined up on a shelf in my room and I give them a live pinky every week. I'm at work right now so I cannot post specifics on temp and humidity until I get home in a few hours. I have heat pads up against 1 side of the enclosures and the snakes (all 4 of them) spend most of their time in the middle of the enclosures, sometimes closer to the cooler end, sometimes closer to the warmer end. They are on a thermostat with the probe on the shelf a foot away from the tanks so will be on any time the temp on the shelf is below 80F.

Snake #1 is eating like a vacuum cleaner and growing like a weed. He's about ready for fuzzies.
Snake #2 is also growing nicely, a bit smaller then #1 and a bit shy when it comes to eating.

Snakes 3 and 4 hatched a few days after 1 and 2. They are active and seem healthy, they drink (I have seen them drinking), but have yet to eat their first meal. 7 Weeks old, neither has eaten yet, neither has grown, both are now nearly half the size of snake #1. I put a live pinky in their enclosures, they smell it, they look at it, then they ignore it and the pinky ends up starving to death. I have tried cutting them with a razor so they would bleed a bit, I have also tried splitting open their skulls to expose the brain. The snakes still ignore them.

Any other things to try?
I guess trying to force feed is an option as a last resort, I've never done it before and the snakes aren't the slightest bit lethargic so they will fight it.