I use an organic nute lineup and feed my girls water the last week-10 days.
During the grow I prefer to walk a thin line between adequate watering/feeding and making the girls 'need' it when I do feed. I think some light stress from less frequent watering will encourage root growth and trich development. I did some side by side comparisons with clones in identical conditions and I kept one more moist and the other I would let dry out much more between watering/feeding. With the plant that I kept moist I had slightly larger buds per plant but the yield per plant was very similar as the plant fed less had more dense bud weight from having more resin.