Do you have a source?
I made a summary of our tests on leoric crown here
You can also check page and 3 and 4 for the details of the tests. over 20 runs were done, nobody ever got the crown sub level 20 and at least 15 runs at Level 20 or above got the crown.
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To elaborate: Bind the force move button! Sometimes you want to move past mobs without accidentally hitting them (i set it to space bar and mouse button 5, thus having multiple ways to relax my LMB-finger)
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On to topic: The first thing that springs to mind is to make a run through one of the acts where you force yourself to pickup and vendor all white and grey items lol. And make sure to explore every tidbit of each area in that act so you dont miss a single one!