One more suggestion: I had an Aeris XT with a hard plastic plate, and I think the part was common to some other BC's ( I think Genesis was one). The plate can crack near the cam band. Since the strap does not lace through the inner pack the tank can flop around. Also the crack can be under a piece of rubber gripping material.
With the tank out, pull on the strap and twist it to make sure this isn't the case. Hopefully you'll not have that problem.
Dennis
With the tank out, pull on the strap and twist it to make sure this isn't the case. Hopefully you'll not have that problem.
Dennis