OP
The way you expressed it, it made it sound like you could have "surplus air", which is fine to have dump out when you roll to the right, because (you made it sound like) that wouldn't affect anything. I'm saying that, if you're neutral, all the air in the suit counts. So, if you roll right and some dumps, you're not going to be neutral anymore.
I like to be roll any which way and stay neutral. That is why I turn my exhaust to closed once I get to depth, so that my buoyancy won't change, even if I roll right.
You made it sound like the way you are doing it allows you to roll right with no consequences - when there really are consequences. With a wing for buoyancy, you can say "I am neutrally buoyant" without having to include the caveat "as long as it's not dumping air".
Beyond that, I don't see how anyone could find it easier to control their buoyancy and trim with excess air* running around in a much larger overall space (i.e. in the drysuit) versus a much smaller, fully controlled space (i.e. in the wing). Air in the wing seems much easier to control. It doesn't get out unless you vent it. It can never go into your feet. How can excess air in your suit be easier than that? I like being able to turn on either side, get inverted, or do whatever gymnastics come to mind underwater, without any excessive work to manage the air in my drysuit. Extra air just for buoyancy would run a good chance, if I went completely inverted, of running to my feet and expanding them enough to blow my fins off.
Also, a question: If you never use your wing for buoyancy, how do you know that it's going to work and hold air if something happens to your suit (i.e.a rip in the suit or a seal) and you suddenly need your wing for buoyancy? In a redundant system, I prefer a standard operating procedure that inherently ensures that both systems are working and available. If my SOP is to use one system for comfort and the other for buoyancy, then I will know quickly if either system is not fully operational. OTOH, if my SOP is to only use one system for everything, that really lends itself to eventually having a situation when you don't find out that the redundant system is not fully functional until you actually need it.
This just sounds like you are more proficient in precise use of your suit inflator than you are with your wing inflator. Maybe the suit inflator simply doesn't have as high a flow rate as the wing inflator. To achieve neutral buoyancy, you have to put the same amount of air somewhere, whether it's the wing or the suit.
One more question: Why won't your system work for doubles? You can put enough air in your drysuit to compensate for the negative buoyancy of doubles, right? So, how can it be easier than using your wing for buoyancy with a single tank, but not easier if you're using doubles?
*excess air, in this case, meaning any more air than is needed to simply let the undergarments achieve full loft. If the response is that just enough air to loft the undies is also enough to get neutral, so no air is needed in the wing at all, then I would say that I am skeptical you have enough weight. I.e. skeptical that if you had an emergency and needed to use ALL the gas in your tank, you would be able to hold a 10' stop without corking to the surface. But, I suppose it is possible. If that is the case, then sure, you shouldn't put air in your wing just to put air in your wing. But, what you're saying there is that with an empty wing and the suit just having enough air to be comfortable leaves you neutral, with a full tank. Okay, so, if it's an AL80 and you use it right down to almost empty, it's going to be almost 6# "lighter". How are you going to keep from corking then?
