Hi Luke,
I was always told that up to 25% difference was within tollerance but as I said I don't allways rely on comp test and prefer vac or cyl leakage. As you said in your post, I would probably expect vac gauge needle fluctuations with a valve related problem. Has the new coil been fitted yet? I would also question the code that you have put ? against, camshaft pos sensor outside set range. Is that an historical code from the cam belt shredding or is that a new one?
Regards,
Bryan.