Snakes can go a long time with out eating. Force feeding is very stressful and traumatic to the snake and I would not even think of force feeding until six months or more have passed. Force feeding can cause damage or even be fatal.

At times most of my constrictors have refused meals and eventually started eating again. Try going back to the smaller food item. Are you feeding inside his cage? If not do so. Feed him at night and when he has struck/wrapped continued to jiggle the rat pup to really get the feeding response/constriction going. Then turn out all the cage and room lights and leave the room for an hour or two and he should eat. Hope this is helpful and good luck with him. Bill
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...three years ago it was just another snake cult...
The Retic is King.
Anacondas-the other Dark Side.
Afrocks-the dark side of the Dark Side.