Had low compression in 2 cylinders resurfaced valves put in new valve springs changed timing chain now you have low compression in all cylinders?

Would like to know if you shot some oil into the cylinders after the initial compression test and if there was any change in the results with the second test. Increased compression with the wet test would suggest worn piston rings.

Hopefully the valve seats were resurfaced too. If the compressions are even it could just be that though the valves have been reground they just need to 'bed-in'. Also, check the valve clearances are not too tight.