Hi arnout,
I do not complain about poor engine running at all. Just did the compression test as a routine task as i have the gauge.
BTW last time when i checked the valves, about 2 years ago i did the compression test again and all cylinders were fine then. Anyway i also suppose there is stuck rings in this cylinder as you said, so tomorrow gonna put some kerosene to see if it helps remove carbon deposits if any.