IMO, you've done what needed to be done to troubleshoot your problem. You've tried 4 different scopes. You've tried 3 sets of rings, even flipped your rings. Still almost off target at close range with scope maxed out all the way left. That leaves me to think the rail is either not mounted correctly or something is bent on the gun, or like posted above maybe its clipping. Don't know if you saw the Edgun video,,but did you try the Edgun test of running over the rifle with a SUV... lol.
How old is the rifle..? If its under warranty(or not) still might try an actual phone call to Airforce and try to get someone that can give you technical help. Don't give up, be persistent but polite and descriptive in detail. Not sure if you've actually spoke to someone there or just had email/text conversations..? Sometimes in text convos confusion can easily occur. As we see in a post on this thread about suggesting you to zero at 40 yards when your post seems to say its almost off target to the right while at full max left adjustment on the scope at <10yards... So confusion/misunderstanding seems all to frequently the normal in text conversations,, unfortunately...
Not sure why they sent back the gun still malfunctioning, maybe they were confused about your problem. Keep trying to speak to the right person at Airforce, I doubt when you find this person they won't want to correct any drastic problem with one of their guns...
Please keep us informed as I was about to pull the trigger on a big bore deer gun Airforce Texan and would like to know more about satisfaction dealing with Airforce's customer service and ease of warranty claims...
jmo