I think most anyone who changes string/cables will see a difference of some sort and new tuning will be needed. Its almost impossible to put on a new string and set of cables and get it exactly as it was before. Think of this also, after you shoot a couple hundred shots the new set may very likely "setin" and bring it closer as to where it was before. If nothing was damaged when the set was changed, most likely a twist of the cables or string one way or the other may be in order and perhaps you haven't found the spot yet. I only have other thing to say........these newer bows(any brand) shot with the lighter arrows of today are NOT any easier to tune than older bows. Now because of the newer string materials and the advances in bow designs/materials, they certainly are easier to keep in tune, once tuned.