Low RPM chain type rattle

My '80 is using a stock tensioner with a "back-up bolt and nut".  The current project I'm working on came with a ZX-11 tensioner.  The "heavy duty" spring in the ZX10 tensioner was removed and replaced with a "lighter" one.  The "awl" was removed and replaced with a small piece of brass tube.  The piece of tube prevents the "plunger" from merely falling out.  The end cap was drilled and tapped for the back-up bolt and jamb-nut.
In my opinion which is based on some common sense and over 40,000K on the similarity modified OEM in my '80; It's less about the tension(pressure) that the tensioner applies and all about having the minimum chain-slack to prevent chain-skip.  The lighter spring maintains some contact between the Rubber Roller and the chain via the tensioner and equally significant - eases the wear on the Nylon Sprocket if it's still being used.  A back-up bolt is required for obvious reasons.