Cheers for the help so far lads.

So is it safe to conclude that.......

- The breather system I have is more than up to the job of 26psi boost?.
- The generic o-rings, half moons and cam seals are fine for the job (ie. I don't need to find some better quality ones?)

All I need to do is use a heap more sealant than I have been and maybe torque the cam cover bolts down.
Is this a common problem among high'ish boost Sapphires?
I hope this sorts out my oil leak