That's alright, you're doing the right thing by feeding lightly. Maintaining healthy plants is far easier when they never get too much...
I know "experienced" growers who run autos, and get 1-1.5 OZ from each, because they dump way too much shit on them in the false belief it makes them grow faster.
What medium did you run them in? If you have any sort of decent soil, you shouldn't "need" to feed much anyway!