proof #1:
from https://treeofsavior.com/page/news/view.php?n=1922
20. The tooltips of Item [Planium] and Buff [Looting Chance] will now be in more details.
-
The tooltip of Buff [Looting Chance] will now include [increase the drop rate of Legend Materials].
vaivora weapons is not a legend material and not an unindentified equipment like berthas and primus -
The tooltip of Item [Planium] will now inlcude [Legend Material].
proof #2:
greyhiem at ktos already researched it
proof #3:
someone got vaivora weapons from field hunting with just 800 loot chance
conclusion:
loot chance affecting vaivora weapons drop is just PLACEBO EFFECT!