oh and one more thing... When I remove the plugs, saw clean oil on the threads and tip of the plugs. I replaced rocker cover gasket but still does it. I am thinking that this changed the compression scores. Theory is that, the pressure in crank case goes up and forces oil through rocker cover gasket and it makes its way to the plugs (2 plus I think...). So when I removr plugs, oil went inside thr chamber and increased compression. .... So this time I will remove all the plugs. Let any oil go in. Then put the plugs back in and fire the engine so it burns any oil. Then perform the test again.
If readings are the same then I will blame oil again. Else it is the engine.