If a taste left you with a hint of CO2, and you are going to bulk age for a couple of months under an air lock, then you have no worries. Even 6 gallons of club soda would go dead flat under those conditions. Absolute degassing is really only necessary under two or three circumstances:
1. You need to bottle very soon.
2. You can't bulk age under an airlock. Maybe the only storage space you have requires that the carboy be on its side.
3. You can't do an extra racking or two to clarify any remaining sediment that resulted from insufficient degassing.
I first made wine in the '80's and had never heard of degassing, clarifiers, or any of the modern technology we take for granted now. Gravity and bulk aging seemed to work fine back then. No reason it shouldn't now.