[ClownNut]

start from bottom.
what your no3 and po4 reading? dosing no3 and po4 will work, only if you are limited on one of those.
if you carbon dose, do you skim wet or dry? compare before carbon dose got more or about the same amount of skimmate.
you have sandbed? my old 180 with sand take a long time before carbon dose kicks in, but my 300 bb take no time for the carbon dose to kicks in.
also try not mix method, each tank is unique. if you want carbon dose, carbon dose and if you go gfo, go gfo. try to change one thing in the formula and give it enough time to do the job. i dont mean like a few days.
on cuc front, try some tuxedo urchin and rock urchin. i got 2(t) in my 34g and 6(2t4r) in my 300. i havent seen any type of algae beside coraline algae and few bubble algae here and there on my rock for years now.