I never use my wing when diving a drysuit. Two bouyant elements on one dive is asking for chaos in an emergency. If you're properly weighted there shouldn't be too much air in the drysuit: if you have to add air to the BCD it suggests that you are over-weighted or wearing too little insulation, allowing the air to form a bubble instead of distributing evenly around your body. Having my bouyancy distributed evenly, and only worrying about one inflator (I use an APEX adjustable dump valve on my left bicep) helps me to concentrate on my camera. I do find that a little weight on my ankles and trim weights on my wing help, with the balance in pouches: I hate weight-belts!
Personal choice this. I find no issue with keeping a track of my buoyancy using both drysuit and wing. As I said I only use suffcient in the drysuit to take off the squeeze. Main reason is if I loose buoyancy for some reason, it won't be all my buoyancy. I agree that shallow drysuit dives are more awkward than deeper ones. Doing it while just learning makes it more difficult still!. Ankle weights are definitely useful when doing photography!