From what you are describing, your most likely problem is your center shot. For most manufacturers, center shot (inside of riser to center of arrow) is listed as 3/4" to 7/8" with 13/16" as optimal.
Here are 2 ways to test center shot other than just measuring off the riser
1. Nock an arrow. Put the bow between your feet facing forward, and look straight down from the top. If you are able to line up your arrow with the direct center of the 2 limb bolts, then your center shot will be close.
2. This is easier to do with a friend: nock an arrow and then had your friend hold the bow. Take a 2nd arrow with the field tip remove. Run the 2nd arrow on the inside of the riser (tip end towards the shooter), over the berger hole and running parallel with the nocked arrow. The arrows should be the same distance apart (approx. 1/2 inch) for the full length of both arrows. This will prove the nocked arrow is running perfectly parallel to the riser. Basically you are using the 2nd arrow as a long straight edge off the riser.
The 2 other issues, but less likely are:
1. Fletching contact. If you are still shooting good groups then this probably not the issue. An easy test is to rubs a little red lip stick on the outside edge of the vanes. If there is contact, there will be lipstick on your bow or rest. This will not work with a Whisker Biscuit.
2. Improper sight set up. I believe some spot hogg have the ability to mount the sight housing on either side of the vertical mounting bar. If it is on the wrong side you could run out of windage adjustment.
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