That's a close call. I used to ride with a friend about 270 lbs. and at least 6', could ride everything but Drop Tower (go figure), later approaching 300 lbs. couldn't ride much. Even wood coasters too uncomfortable. Did fit on Anaconda but he wouldn't have been able to handle I305, so never found out. We used to love SLCs, only recently I realized that's because the oscillation frequency of our car was different that everyone else's .
Have you tried other parks? Shouldn't be that much different.
I haven't been to a park in a few years.. and that time period is when I gained the weight.. a lot due to the fact I was put on steroid treatment probably 4-6 times.. which always seem to bulk me up.. you saying this now has me worried again.. sigh.. I really want to be able to ride the rides with my daughter.. if I can't ride them.. she won't either.. now I don't know what to do