I thought you were one of my friends at first because they also have CX300s and A8s, haha.
I am using a pair of SF5P with my iTouch and I don't seem to hear much hissing, if any at all. Its been pretty much a perfect pair of IEMs for me now that my ears and I have adjusted to them (remember to use the F/S mod!)
The cable is pretty thick, but you can always do a cable mod.
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