False Gods have about 100 cards. Osiris has way more than 7 pharoahs. If he had any less, it would throw off the balance because it would take way too long just to draw one pharoah. Then, you might say to cut down the amount of cards in a False God's deck. Then, they would deck out too fast because of their double card drawing power. If you want to cut that out, then False Gods would be just as easy as AI5s.
You see, changing the way False Gods play now kind of throws them off balance. That's why I think they are perfect as is.