I am really reluctant to change anything but feel free to give this dosing a go under strict testing, i.e test in 3 days then 5 then 7.
To get nitrates to zero using just the additives and not the Lith rock is quite a challenge and you may have gone as far as you can go with the nutrients, that being said they are at levels that many reefers would love to have.
after 7 days and as long as no fading of coral colour or lightening within this time, go back to what you were doing but the bak at 5ml and also add 2ml of min-s directly to the tank a day, but we will get to that next Sunday.
if you have room in your sump for a media bag I would look at putting lith rock in there and go full ULNS but thats up to you.
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