| I have never tried doubles inverted, I would think that having the valves down, it would keep the weight below the waist, thus giving a seahorse trim instead of a nice flat trim.
Also reaching the valves should be more difficult, once you start piling up stages. The valves would also get easily damaged when going on a boat for example.
My husband and I have just switched from a typical doubles DIR set up to diving Kiss rebreathers. We have rigged our tanks valves up and we have definetely improved the trim and the accessability of the valves this way. |