Are you using halfmoon nocks they do not work well with a 10 point or an excaliber.
Check the scope mounts ,rings and the screw on the fame to action for tightness.
My exocet will hit an orange every time at 35 yds so I suspect you have some sort of a problem.
When you shoot use a bench rest of some sort so we can eliminate human error as much as possable.
Make sure the roller s on your rope cocker are turning freely, that your arrows are back solid against the string,
that your arrows are straight aluminium can be bent in shipping the others are sometimes made crooked, try the iron sights to make sure its not the scope or the mount. Lee