Though apple and pork are a nice combination, try either a different juice with full fruit but a significant sour component (tamarind, pomegranate) or try cutting the sweetness of any sweet juice (apple, pineapple, mango, et al.) with a sour juice or a souring agent. Just a couple or three T, at least somewhat reduced, meat down. If you wish, do a light reapp of the rub after foiling. See what you think.