I think you need to do what you are comfortable doing. I don't think I know of anyone in the UK who has been told to limit feeds, they always say if they are draining bottles to add another oz. I have never limited my two, they took what they wanted even if it was a small feed.
If you want to stick with the BW way then go back to what you were doing before. I think a 6oz feed at 14 weeks is pretty average really, some babies are taking 9oz at this age some less. A lot of babies spit up it's only a cause for concern if it's large amounts and they are in pain or discomfort with it - remember too that a small amount of milk looks huge when it is spilled! How is he when he feeds?
What are naps like in the day? That can have an impact on night wakings and sleep is as much developmental as calorie driven.
Laura