I would say if they are doing well on the combination to stick with it, although I don't personally rate JWB anyway - rice is the first ingredient listed at 26%. Meat comes second on the list and its actually meat meal not meat.
Applaws dry is certainly better with regard to meat content and low carb content. Orijen is pretty good meat content too.
Hi Life dry compare well with JWB - take a look at the ingredients - organic meat is the first ingredient listed at minimum 26%, ok it still contains rice, but at least that is second on the list after real meat!
Fresh Chicken Recipe 