How many plants occupied your 1000w besides that auto?
I don't mean to be rude, but 3oz dried from a 1000w isn't really impressive.
It's a good amount from 1 auto plant, but I'd be dissapointed with less than 1 dried lb from a 1000w.
If you haven't tried a photoperiod plant...it's time!
I've had a WW auto yield over 200g (closer to 8oz) alone under a 600w, that's why I'm curious if it had 1000w to itself.
You'll get double the weight on photoperiod plants with just a minimal veg time.