...using a standard backmount stage rigging (GUE style), all you're going to do is look like a rebreather diver when your tank butts push laterally past your primary tanks...
Does that really matter with the technique shown in the video eternaljonah posted (
October 17th, 2014, 11:27 AM)?
(Which can be used with any type of sidemount system, in my most humble opinion.)
I am not using stages often myself and am not a technical diver, so I am just asking not advising, don't get me wrong there.
I was in the water today testing a stage regulator I am in process of buying used third or fourth hand, so I breathed the stage down completely and it never moved more than a few inches (because it is held in place by the main tank).
I also blew a pressure gauge swivel on the second dive on the single tank on the other side and had to turn off that valve and also breath down the other main sidemount tank to a few single digit bars, also no problem after re-clipping the breathed down main tank to the front D-ring and since I front/bottom mounted the stage I did not have to re-clip that one at all.
I am using sidemount rigging with a bungeed boltsnap on the valve, but that's just convenience, as all my tanks are used sidemounted anyway.
Using normal stage rigging the tank would be turned 90degrees, resulting in an awkward first stage position, but otherwise I see no difference.