I'm the same height as you, although admittedly smaller framed at 70kg, and I have no qualms with my (genuine) Bride seats. It might be worth seeing if you can get yourself in one to try it on. I know most guys here will scoff at this suggestion, but they are styled similarly to the standard seats, so if you're currently using the standard seats with a harness no worries, then it may be worth looking into. That or maybe a Recaro, considering the other popular brands didn't suit your needs.