Depending on how far off it is, it may not track correctly through a loop, or dip the right wing when landing. I'd balance it out. This usually only takes a small amount of weight. I figure out how many BB's it takes, drill a small hole in the wing tip, lightly coat the BB's and insert them into the hole (leave out 2-3 to compensate for the epoxy), then patch the small hole. Double check the balance, and you're done.