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The concept of single/dual bag BCs should not be considered alone. Yes, it is
safer to have dual bag BCs with your dry suit, but do you really need it. It
will
provide additional drag in a current or when scootering as well as adding
additional equipment to manage. These items have to weighed against each
other.

Other things you need to consider in addition to the number of BCs bags is the
lift available on each alone. Twin steels at 100 plus feet can be very very
heavy. Have you tried fully deflating a BC or dry suit (Yes it is
uncomfortable) to
see if you can still lift yourself off the bottom. I think you will be amazed
to find
just how negative you have become. This problem is compounded the deeper
you go or the more equipment you carry. 

One advantage of dual bag BC's is that when you do use a wetsuit, you have
no need to reconfigure your equipment to retain your redundancy.

There is always such a thing as too much or too little but no such thing as THE
ONLY way, only a "Seems to be working OK in this environment way ".    In your
situation, you will need to look carefully at the depth, equipment and current,
and then make your own valued judgment.

If you would like a personal view. I wear a Dive Rite Transpac for all dives on
twins, regardless of whether I'm wearing a wet suit or dry suit.  I live with
the drag
and sometimes curse it, but I haven't changed because of it.

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