While weighing 368 I rode a 1991 Giant Inova and didn't crunch the wheels. No curb jumping annd I kept the tire pressure maxed, I meen ck'n every day which is best done with a guage equipt pump as each time you you a sep. guage precious air's lost. The tires were semi-knobby 28mm. Even now @ 230ish (or so @ times) I've tried soft-tails and find 'em bouncy. Don't fret over wt. or trading-up as far as your future goals. If you want a FlatBar hybrid or a MB with or W/O fr. susp... FINE.
Focus on better OEM wheels, 36sp. if... OR beefier 32s. think custom or "special" wheels when and if you wreck the originals. You're not THAT heavy.. Sorry..
Us heavy wts. can light on bikes just as we can dance-up-a-storm if required.