I defer to others' experience with TSS, but from a purely theoretical level it seems pellet count isn't something you're worried about, thanks to the diminutive shot size and its impressive sustained energy. I'd take fewer pellets and more energy in that situation, with the all-encompassing caveat of seeing how it patterns (and I would be utterly and completely shocked if 7.5 or 9 shot patterns out of an IC .665 are anything less than outstanding. My IC .665 does fantastic with 5 shot lead, but would do better with 6's. Can't imagine that not being even more true with TSS 7.5 or 9).
Make each pellet ubiquitous deadlier.
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