Many thanks for your response. I haven't played with the regular Supers at all, but have had very positive experiences with the JCs. I particularly liked JC 17 and still can't understand why Gosen discontinued it. (I even had a friend here in the US contact his friend in Japan to try to track some down -- no luck.
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I have a set of Super 16L/1.25mm. Will give that a try. Thanks again.