I think that could also explain why he was underfed when I bought him and he had an increased feeding reponse (half a box of feeders a day) untill recently, when he started a normal reponse (4 bitesized feeders).
He was in a terrarium with several other pacmans, all still babies, he might just be that second slower then the rest, because he does take pretty short leaps.
Either way, I really don' t see it as a problem when he's an adult, it's not like he'll run any marathons.
I've also decided to leave him in the curver, and postpone the move untill he's an adult, to not cause him any unecessary stress while he's still young.