Were you shooting Hand-held or tracking with a mount?
I haven't tried photographing the ISS but suspect it would be almost impossible hand-held. I think 400mm is probably going to be a little short too, but again I've never tried it.
There are a few people here that have done it so it might be worthwhile searching for those threads to see what equipment they used.
Pardon my ignorance, but what is S/S?
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