Benjamin/Crosman needs diag

How i ended up with two with same issue i don't know. I have a benjamin maximus and a marauder that when shooting off bench approx 35 yards and will shoot two ragged holes about an inch apart from each other, normally equal amounts, they alternate during 10 shot groups ,I've tried shooting without shroud, added barrel bands, different scopes, different rests, even a bean bag laying across barrel, not sure what to try next, any ideas would be appreciated.