My first new sight was a Spot Hogg and I had the same problem. I was shooting a Fred Bear TRX. I was shooting bullet holes through paper so I know it wasn't a tuning issue. I put on a Copper John and shot lights out. Actually shot a 228 on a 20 target ASA course at one time.
Looking back, it could be a problem with my form, I'm not sure. Wish I could be of more help, though.