sounds more like clutch than CCS. Maybe cush drive.
man, things like this should really be diagnosed (and even worked on) by a professional as coming to this conclusion from a clunk from takeoff- buying a used CCT- and planning on doing it yourself sounds like a good recipe for a lot of problems..
jjman is probably on to the issue.
Try turning the rear sprocket forward and backward with both wheels on the ground. The rear sprocket hub cushions might be toast. You shouldn't be able to move the rear sprocket at all.
P.S. a camchain tensioner noise is usually heard most when the bike is idling and often gets quieter as the engine loads the cam sprockets on acceleration unless its really really loose.
Another reason mechanics pull the valve cover is to set the tension on a "MANUAL" adjuster.
They'll watch the camshafts as they turn the engine back and forth. First with a little slack in the chain, then tighten adjuster and go back and forth again, until they don't have any lag between turning crank and camshaft movement.
People who simply tighten the adjuster while the engine is running until they don't hear chain clacking, often over tighten the camchain leading to premature camchain stretch or breakage.
With what you're describing with clutch release, it's not a camchain issue. Most likely a drivetrain issue.
If you don't have slack on sprocket hub, I would take the time to pull the front sprocket cover also and check your front sprocket nut and make sure everything is tight, rear sprocket bolts as well.