Cam timing is not bad... in the bank i'm having problems with, its 3' retarded (I have the offset keys on order).
All shims/timing gear etc is back on in exactly the same places. It must be to do with me having both surfaces of the head machined. When the head was on the bench, the cam wouldn't even rotate because the head was so warped.
I ghetto'd one of the shims with a flap disk on my angle grinder, retrying it periodically on the inlet valve, and I took it down to just over 4mm. I'm now getting a healthy 190psi! Just got to do the same on the exhaust valve shim now.
Compression otherwise looks great on all other cylinders, between 200 and 180 psi

Edit:
Just looking in the WSM and it says compression should be 8.5 bar minimum (~125psi). Is it a problem that mine's so high?

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Ben

'85 500 SEL
'85 928S2
'88 560 SEC
'90 750i