The compression test is showing an even compression across each of the pistons. Due to the tester I was using (rubber wedge to seal) which is designed for old Holden v8's (old mans 308 and my 253) with far lower compression, I couldn't get a solid answer. But the tests were within 50kpa of each other.
Is there any definitive way of testing leaking seals and guides? Or would I be best to just replace them rather than go through the hassle of testing??

On a lighter note though, The nutter has been getting a few touches of cosmetics.