you should have been doing it for a while now. from about mid veg or so. most coco growers cut back on the suggested nute levels and feed twice to multiple times a day.
there is generally two approaches, start at 50% of the suggested levels and see if it goes hungry, or hit it with the full ec, and see if it gets burnt. the printed feed schedule is only a suggestion from the nute company, and a lot of times they are mostly interested in having you use as much as they can sell.
also autos are notoriously pissy and way more finicky over feedings and imbalances. photos are a pile more fun to start and learn on, plus they almost always give better returns and higher potency.