Mr Woppit, if you wanted a 100mm of travel maybe you should have bought a 100mm bike?
'08 Five around 160psi here, 12st kitted up. There's nothing wrong with getting full travel if you're not bottoming harshly. A good setup with the Five is to run it a little soft because it firms up under pedalling. It sounds fundamentally wrong but it's actually one of the reasons the Five is so good.
Molgrips, I disagree with the propedal statement, that's not what it's for at all IMO. It's a platform and if you're getting full travel too easily propedal won't help as you'll be going through the platform anyway!