[embee]

2 possibles spring to mind.
You must ensure that the screw adjuster/locknut which operates on the end of the pushrod has enough slack such that it doesn't go tight when the engine heats up. When adjusted correctly you should be able to lift the end of the operating arm where the cable fits by several mm before it takes up all the slack. The "mantra" as you call it says that with the cable fully slackened off, and thus the operating lever fully against the stop, to back the adjusting screw out by 1/4 turn from just making contact.
After setting this the cable can be adjusted, again this must always maintain some slack so it is not putting any load on the pushrod.

The other issue is the oil type. Are you using a bike specific oil which has "JASO-MA" on the label. This is the standard showing it is suitable for use with a wet clutch. Car type oils with friction modifiers can make the clutch slip.