I tend to use my wing only to fine tune between sets of gear and different underwear. For example, if I am wearing twin HP steel 130s, I don't need a weightbelt. If I am wearing 400 gr underwear, then I need little exra air anywhere for buoyancy.
On the other hand, if I am wearing my 200 gr undies, I tend to put some air in my wing, rather than have a lot in my suit.
Anyway, it's personal choice to a large extent, with allowances for gear and so on.
But do do a buoyancy check before you go anywhere! You will be surprised at how much lead can be required to sink a drysuit in saltwater!
And if the thing does get away from you, relax and enjoy the ride... just breath fast on the way up!