The plants look great! I wouldn't feed them any more if you are still getting high PPMs out of the outflow... there is probably stall a LOT of nutrients in there. Phosphorus is one of the main ingredients in bloom boosters and siimilar products, but too much phosphorus can impede the absorption of Magnesium, Potassium, and calcium to some degree. This is often the mechanism by which the well known term "Lock Out" originates and why you often see it in later flowering. Phosphorus is difficult to remove from the soil, unlike nitrogen and potassium. Flushing often doesn't help too much and can deplete the nutrients that are needed, if done too often.
I try to avoid situations that add too much phosphorus, such as going easy on multiple bud boosters. If you are using FF Ocean, you probably still have a lot of stuff left in it. The items that are leached out most easily are nitrogen and to a lesser degree, Potassium. I feed a balanced 20-20-20 mix during vegging, and a std flowering formula for flowering (not sure of the ratio). During the last few weeks of flowering I might add a bloom booster, although I don't, but don't use it too early or often or it can cause the lockouts I've described. There is a great article about excess phosphorus and high calcium levels... two of the main things growers are being told to pour onto their plants, and the problems/lockouts that can develop.
Your plants look very nice. My recommendation would be to feed them very sparingly making sure they get a little nitrogen (not too much!) and to cut back on the other nutes until the end of flowering probably a few more weeks. They are getting big but they need to fill in more and fatten up. They look great now but after they dry they will be much smaller... let them finish flowering for the best taste and effect. Don't go by just the trichome coloring... let the plant tell you when it has had enough!
