I don't know about the scope problem (I shoot with pins), but I had a few ideas about accuracy. The string does cause windage problems if not cocked straight. I use the whiteout-lines-on-the-string method to check if I hand cock it straight. Make sure that the bolt is seated on the rail the same every time and make sure it is back against the string before you shoot. Make sure that your bolt is straight (not bent if aluminum). Make sure that the crossbow is held horizontal and not canted to the side. I've found that just a little cant can throw me off quite a bit. Most of the time with me, when I miss, it's me. I pull the shot when pulling the trigger or I willdrop the bow slightly as I shoot.You didn't say how you were shooting, but if you were shooting offhand, try setting up a table with a chair and shoot off a "bench" to determine if it is the crossbow or the shooter. Try setting the crossbow on something soft but solid that won't allow it to move when shot and see if it's consistent. If so, then you need to work on shooting form. Hope this helps. Grndhntr.