I'm not sure if the phosphate removers work. I've heard mixed reviews. Your goal is to try an keep nitrates at about 10 ppm. I can't tell you how much and how often to dose. The answer varies greatly depending on the size of the tank, the needs of the current plants, and the level stocking level of fish in the tank. Best advise I can give you is to dose small amounts and test after each dose keep dosing and testing until you get to the desired level. Test again the next day and see how much your plants have sucked up. This should give you an idea of how often to dose again.
As far as the other ferts go..honestly I'm not all that well learned on dosing of all the individual ferts. But I don't see why you would need to change. I would guess that if you need to cut back it wouldn't be by much. Hopefully someone more knowledgeable about this will come alone.
Edit: There would be someone more knowledgeable ^^^ posting at the same time.