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I'm referring to a BC which has the bladder in the back. A wing would be an example of back inflate, but many jackets are also back inflate, the Black Diamond, for example.No i was diving a jacket style bc.
By a back inflate do you mean wing style?
Three things can affect your trim, AFAIK... Ballast, buoyancy and energy.
It sounds like your ballast is balanced, so I'm guessing it has to do with buoyancy. If the bladder tacos a bit, it can isolate the left from the right and allow more air on one side than the other. This results in the side with more air providing more lift than the other side and you roll.