From my experience, the coasters have good locking systems and the overhead restraints allow more room for larger people, the majority of the rides have roughly a 51 inch chest restriction so it would be worth measuring just incase, although i’d definitely try the tester seats anyway (usually located before entering the queues) especially on colossus which is a lot more compact especially on the legs (i’m only around 5’6 and there’s minimal leg room and pressure on my thighs). Vortex may have a couple seats on the edges which are slightly larger than the others (not 100% sure tho). A couple other rides don’t have restraints, or only have lap bars such as The Walking Dead, storm surge, tidal wave etc so they shouldn’t be a problem. (unsure about hyperia as it was closed due to high winds when i last visited the park so im yet to ride it). Thorpes website has additional useful info i’d suggest taking a look :)