im about 95 kg and riding an ocr3. only problem ive had is with the wheels too. it was a recurring problem with my back wheel until giant was decent enough to get it rebuilt at the store where i bought it. planning new wheels hand built at another store when i'm ready to part with the cash. despite not being ultra clyde, i'm heavy enough to break spokes fairly regularly on these rims. the bloke at the store where I'm planning on getting new wheels told me to stay away from shimano considering my weight if that's worth anything. i assume latest model ocr2 has stronger wheels but you never know...
i recently got fitted and was told I should've probably not bought a giant considering my particular er...dimensions(?). my stem is now at a pretty high angle and all is going much better (a bit strange looking but i'm not at all fussed) but next time I buy a bike I'll be going to someone who knows a thing about fit as it all feels much better now.
good luck and enjoy the bike mate (when you get it)