yeah, if you really used the wattage you say you used.. dude, you should have had a WAY bigger yield than that... WAY more.
I realize the final yield of any harvested cannabis plant.. depends on many different variables. Environment, lighting, watering, nutrients, temps, humidity, and of course.. the genetics of each plant differs from strain to strain. These all play a huge role in the final product including the final yield at harvest time.
But either way.. even with the worst conditions.. you should have had more product than that IMO.. considering that you say you used a 600HPS then a 1k HPS.
better luck next time kid..
peace.