What do you mean by midas not scaling with dexterity?
I have been building a primarily dexterity based character, I have tried the midas touch charm multiple times with and without the lucky charm however it appears to only proc on average every 10 hits around 100 dex, and seemingly less on 200 dex. In theory it could be an issue of the value being 5% instead of the listed 50% chance. My other theory was that it was not taking into account the players increased attack speed. Just a theory though. o7