Hey guys (and I just asked my sister the other day which was the Carey Grant film in which he played a cat burglar, so now I really won't forget!)
I do usually use med-high or high tension strings on my other guitars, but I find that my Stephen Hill has an inherently stiffer build, or whatever you want to call it so that high tension strings just feel too high for me on that guitar. But having said that, if the med tension ones feel low then by all means try going up incrementally until the left-hand to right-hand balance feels just right for you. I seem to remember that that particular guitar was a little less stiff than mine. And yeah, any new guitar means a lot of string changing to find the right set, but it's usually just a month or so of that and then you're good (unless you read too many forums about string choice and get restless again, which I stopped doing ages ago!).
As for nails, I think I'll do a blog post about that. I've been putting the same stuff on my nails for over 20 years now, so chances are you guys know better than I do what's new out there, but I'll explain what I do (basically fiberglass paper and enamel powder) and my thoughts on nail shape and all that. I'll post a link here when that's up.