I thought Seiei Enbu wasn't best for combos, given the hefty damage reduction. Yun's Genei Jin doesn't suffer this problem though, and that's the best for racking up monster damage. IMO, to use Yang's super well, it's all about mixing up slashes, high and low attacks (using those medium hit moves) and his teleport to confuse the opponent rather than a barrage of comboable moves. Can't remember what to do exactly nowadays, though, it's been a long time since I used that super art.