Summoners War: Chronicles

With the addition of the hardmode, the rewards line show that you can drop 3 times as much crafting mats from the runes dungeons, however the droprate feels 3 times lower than what it used to be?

At least on shoerekly, after dozens of runs even with the x2 from the Summoner Pass I have dropped less than 20 crafting mats, mostly coming from one big drop of 6 due to the battle pass x2.

Am I being extremely unlucky? It sure feels like there is something wrong, the number of runs I've been doing should be large enough to even out somewhat bad luck.