I laughed pretty hard at the Kushala thing, I have to admit.
But yeah, I can see where you're coming from with the whole lucky and unlucky thing. Honestly, I think I'm getting pretty lucky over-all lately, besides with getting Kirin Thunder Tails. Like, I got two FW Marrows in two runs from A Troublesome Pair. So I can only imagine the other things I'll get now.
Speaking of which, I also got another rust stone on my last mining run while I was looking for a Firestone, which I also got. Seems like the game is showing me some mercy because a giant crab is kicking my ass every time I try to fight it. Ahah.
Heavenly Scales, though, huh? Sounds like something I would /never/ get, simply because that's not my luck. It took me 72 Los runs on MHT for one plate scale, and after that, I got tons of them. That's my luck right there.