I did the one side b-feeding the whole time and worked very well.
But as Samuel's mom says, if two-sided is working for you, your DS is gaining weight and sleeping fine, then stick to it.
ON the other hand, it's still early days and I'd say you could still change if you want to. What I would do, would be b-feed from one side more time than usual, and then switch at the last min to the other side. The next feed start with the last breast you used and change to the other one at the last min, just as you did before. After two days maybe you could completely do the one-side b-feeding.... I'm just thinking that this way you would give your body time to adjust to the new routine.
Having said that, I'm not sure if this would work, maybe someone that is currently b-feeding could give some ideas as well.
Good luck!