Gem, plenty of pups 'do the dance' when they start, its simply excitment. Your pup, i'm sure, will settle with time, as long as your recall is good and you put plenty of gear infront of him.
I'd just add that though rewards do work, I've never used 'em in the field, the game itself is reward and I certainly wouldn't use rabbit heads Praise, once back to you with the prize is enough but keep it to minimal and move on to the next target. JMO but as a working lurcher, your dog is bred to do a job, that is to catch and carry to you. Treat it like a king back home once that job is done.