Hey sang, you'll love the cobs I'm sure. I'm subbed.
One note of warning - my girls get 4ml of mono cal and 4ml of mono mag PER LITRE and they seem to be thriving - no deficiencies. You may get away with less, but they eat their way through it and no mistake! I started off lower, 1ml of each I think but moved up to the present 4ml of each within a couple of weeks.
What are the cobs drawing at the wall? Mine are turned full up and are between 45 and 47 watts each. I have two in my 120x80 tent, and one in my 2x2.