part of the parallax problem is that folks think scopes are foolproof.
I center everything even with a scope, probably a habit from shooting irons so many years, but I digress.
Sending it back to bushy because the first round is only an inch out won't generally get you anywhere..
I sent a TC barrel back once, it was shooting 4 inches at 100... they shot a 5 inch group and sent it back saying it was acceptable... so I bought a new barrel for the gun. Renegade 54. Factories don't much care about tiny groups generally speaking