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If you can't put a compression gauge on it and actually determine what the compression is and which cylinders are weak, then pull the head. I figure your looking at some sticky valves. While you've got the head off scrape all the carbon off the tops of the pistons, the valves and the rest of the combustion chamber. Pull the valve cover and grind the valves while your in there. It also can't hurt to clean up the water passages in the block. It would really be cool, if you've got good cylinders and your able to pull the pistons, go ahead and re-ring it too. Then you've stood a good chance of really improving the compression. At any rate I guess tour dealing with sticky valves.