My scalp used to be a little oily before starting to CO wash and starting to wash less. Honestly I think the extra massaging that you do when you CO wash has helped with that. I also think that the less I've washed and the more days I've gone in between, the better it gets.
Last summer I had to clarify with a clarifying shampoo a few times and I had a hard time with my hair but this summer it's much better. Over time it just keeps getting better.
2b/3a, primarily use Jessicurl and DevaCurl products, Curls Hair Tea conditioner and various gels. I'm modified CG-ish since 5/04.