I just recabled a pair of the Classicals with a cable I took off some Jaben hippo iems (really nice quality cable, braided shielding along the whole length, each channel separated, good strain reliefs, very flexible but quite microphonic) and it really brought out the detail that these things are capable of. I'm wondering how the Jazz might react to a new cable now..
Also, I've been using these foam tips on my Radiopaqs, they're perfect. They're like the ones that come with Soundmagic PL50, similar to Shure Olives. But they don't have any plastic core in them, so they fit perfectly over the radiopaqs with enough friction not to come off. Isolation with them is great and they're very comfortable.
http://www.ebay.co.uk/itm/160669033080?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649