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Hi Graham,
I think that replacing the head gasket in conjunction with a good valve job (seals, guides, head straightness checked, valves ground or lapped if needed) will give you a long lived solution to the compression problem. The give away is the two adjacent cylinders matching in compression. Human error could account for a 20 psi difference in reading, but not two adjacent cylinders sharing a common reading.
Regards,
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Will Dallas, www.willdallas.us, www.willdallas.org, www.willdallas.com 86 245 DL 222K miles, 93 940 260K miles, 88 765 GLE 152K miles, 87 Honda Civic 96K.
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