I think you're probably over watering/feeding. Give the medium a chance to dry out before you water/feed again.
I don't know about your nutrients. I only use GH (General Hydroponics) and follow the regiment on this thread-
==The Recipe==
That smell will go away when you get your roots right.
Did anybody check for good drainage? Once the vermiculite is wet; the excess should run straight out bottom holes.
Quick, Fast & In a Hurry