you could go for higher string gauge if tension is your concern... but it seems like hex core strings are stiffer than round core ones due to the design. i'm not sure about that though
5SW: so how do u find the blue labels?
i'll probably get myself a set off ebay, or maybe ishibashi (who only stock black label SS). the sadowsky shipping, while very fast, is far too expensive at 20+ USD per set. i think it's because there's some kind of base charge involved
my favourite strings so far were the stock strings on my aerodyne when it shipped from japan. i have no idea what they were, but from the feel and the sound i'd say they were SS (and they were a pretty heavy set too). currently using a set of black beauties, but they need a change. coated strings halfway through their life expectancy just don't do it for me