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I don't think we see it a lot, since its hard as **** lol I mean even aizen had trouble with a level 90's spell. Yamamoto sacrificed an arm. lol I think it's just one of those abilities that requires talent and years of experience and focus. I always thought kubo would make kido rukia's forte, but unfortunately she has merely shown the understanding of the basics. AS for kido spells over a 100? I highly doubt it, considering how difficult 90's spells are; however I think you can go beyond the power of kidou # 100 by combining spells that are bellow 100--which can be seen when urahara fought aizen.