If you really cleaned the barrel well and are that off then I would suspect that you could have barrel issues. It could be something really simple like the breech oring too. With no previous reference you could be getting blowby and not even realize it. It's complicated to start into a sport with no experience and no mentor, though youtube is a big help. I would check that breech oring first, I don't know if it's on the probe or in the barrel, on the avenge X, but your rifle should have come with a replacement oring, Good luck.