Balcony garden is almost planted! Herb Tower

I moved my herb tower to the shadier side of the balcony.  Maybe because of the metal trays - but no matter how much water, or how much coco fiber and peat mulch was mixed into the soil, the herbs just burned up.  Hoping the new spot helps that - it still gets full morning sun but afternoon sun gets filtered through the tree.  It's also less windy on this side.