Before you do a compression test you might want to adjust the valves so you know the valves are closing completely and when they are supposed to.
While the Valve Cover is off look over the valve train and see if anything is not normal.
Also check the Camshaft Timing which can also give you some idea of what is going on with the timing chain.
In the left of this split pic is the Camshaft Drive Gear aligned to the Camshaft Bearing tower. On the right is A pic of my Crankshaft Damper degree marks. In my case showing my Camshaft Timing is about 2 degrees late (past Top Dead Center); indicating normal wear/stretch on my Timing Chain and Timing Chain drive and that I have not jumped a tooth.
