I rode one @ 368, maybe more, scales that ranged were scarce at times; 32 spokes NO problems, tighten 'em if you've a reliable shop. One guy did just that, plucked them to CK, did little else, went unnoticed. I can do it but...a second opinion was in order. As afraid as I was to get back on a skinny tire was as relieved as I was getting on that hybrid (the wife's don't tell 'er) It'll only get easier, core stength etc.
I've waisted enough of your time. Perhaps later. Good Luck, you won't need it.