I think you are possibly comparing apples to oranges, or worn part "ticks" to hydraulic "ticks".
You had some failing rockers that tick when worn out and you replaced them and the tick went away.
Another time you tried an oil supplement and the tick went away, likely due to the hydraulic lash adjuster.
Again you have a tick, more likely due to another rocker failing as is apparently common in some 3.6's
Oil supplements and or different oils can
have an effect on hydraulics.
However, worn out rockers as shown in the 3.6 tick videos tick until replaced, oil will not repair the metal.
The ticks mentioned can be very close in sound which can often be confusing.
As you have experienced broken rockers replacing them all would be prudent.
Replacing hydraulic lash adjusters at the same time would also be wise as they are in the same spot.
Replacing rockers/lash adjusters would be my first step.
If the cams aren't scorched there may be no need to go further.
It only worked for about 6 months to quiet the lifter noise. Now, i am going to have to open up the engine and replace some things to stop the noise. Hopefully, it is not more than the camshafts, timing chains, valve lifters and arm valves thingys