Honestly, my tribemates and I have had minimal luck and low taming efficiencies using the trap method.

So we use the cryo baby method or have a two team, one feeding, one killing and dragging who switch off to keep a constant flow of corpses to an uncaged Carchar. You have time, not long so move fast, to get out of kill range after feeding the Carchar solo. For the tag team, usually the other player is bringing in another corpse as the first is finishing a feeding and the Carchar goes from eating to immediately back into its sniffing animation.

Using this method we have had more than a little luck getting 98+% efficiency with Carchar taming. Not to mention, no prep work building a cage, taunting the beast in and having it go on a foodstrike when you're trying to become friends! Frustrating and SO much time lost!

Hope this helps!