If the wet #1 test improves things, i'd definitely add some synth ATF to the engine and give it a mobile decoke.
It's pointing to either a ring problem or possibly sticky valve. Have you had any head gasket trouble with it at all?
On one of mine the head gasket had been done about a year or so before i bought it.
It developed a slight misfire and it turned out the head hadn't been tightened properly, 2 bolts were only finger tight, three of the rest were only just "nipped up" and the rest weren't even as tight as the first stage of tightening should be (44lb/ft if memory serves without checking the torque settings) so i slackened them all one by one when cold and tightened them as per the Haynes recommendation, misfire gone!
Had to retension the cam belt after as it became a bit slack as a result but i replaced it soon after that anyway.
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Cheers
Dave
Next Door to Top-Gun with a Honda CR-V & S Type Jag  Volvo gone but not forgotten........
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