I got a double-tank rig, and yesterday tried it out in Newton YMCA pool. The entire rig was not properly secured -- it kept shifting side to side on my back. If I tightened the straps some more the rig would be secure, but it would be an absolute ****** to put on. Paul ("P" in PG Dive) told me harnesses exist with pull-tight buckles (is that even a correct term?) similar to those on regular BC's. Can someone recommend me a model of such harness? Thanks.