I'm 4a but my curls are naturally pretty defined. I wouldn't recommend a paddle brush because it will just make hair frizz out and no definition. The rake and shake method should work on 3c hair. I have 4a/4b/3c/3b hair (patches of all but 4a) and it works for me. But don't over do it, because it might back fire and just frizz and lose definition.