Dungeon Difficulty & Drop Rate Feedback

I can live with the fact that my relics level and my roster isn't high enough to clear Insanity levels. Some day... But, if you advertise some talisman dropping from dungeons, it would be nice to get some even if we can't farm Insanity.. For example, I'm over 666 runs of Eddie's adventure - Madness. Not one Brave drop as of now. Same thing for the one before (Einherjar's Path?). No Forge in over 400 runs. I know, I know, this is random... It just feels like being lied when nothing drops. Also if your drop % is infinitesimal can you tell us so we don't bother about it. Thanks.