Ive stopped hunting until I correct this here's the deal. New strings and cables at 10yds Im dead on, but ay 20 Im way low and to the right but with tight groups. What the the heck is going on?
You swapped strings out, so odds are you nock point has changed. The slightest change will make a huge impact.
I agree with Cledus. The guys at your pro shop should be able to help you with this. Did you install your new strings or did someone else?
Was the bow tuned after the new strings? how many shots have you put through them? My best bet is that your bow is out of tune. New strings and cables have come a long way but after you shoot it for a while on new one, you still need to make adjustments, minor ones, but still.