You kno the more 3 of coins u use per boss the smaller the chance gets per 3 of coins, use one at a time for best chances. I am one of the unlucky ones too. Gaming with a friend the other day he dropped 10 exotics in one day I got 0. That's rng for u. But then I get lots of strange coins through bounties and engrams and he gets none. So I don't know if that balances things out. Doesn't feel like it but he constantly moans about having no strange coins so I guess that's fair. I do think there shld be set loot drops in the raid however. I hav the upmost sympathy for those who hav lost 3 hours of their lives for 2 shards.