cam chain tension

Hi guys,

I can lift my cam chain off the sprocket at the top slightly, is this normal.   It seems tighter at different points of the crank rotation.

The photo is a screen shot of my video,  which was too big to download.

Also, the Haynes manual says to loosen the tensioner bolt, and press down on the tensioner itself, to gain more tension , which did improve it slightly.

Is there a knack to gain maximum tension.

Thanks for any replies.

Bob