Ok I'll try Iron on the same day as Macro, and the Flourish every 2nd day, one capfull.I'm not familar with diy fertz. so I can't comment on K amounts etc.
But in reference to your original question, I'd be dosing a cap full every second day. And macro on the other day. On macro day I'd also dose iron. Again 1 cap full of iron (assuming it's a store bought bottle).
Your tank is still very new. Plants are likely still adjusting to their environment.
Do you switch you co2 on before the lights come on? If not, you should. Have the solenoid on a timer. Set it to come on around 45mins before the lights switch on and have the co2 switch off 45mins before the lights go off. You might get faster pearling this way - the water column is saturated with co2 when the light come on.
Down the track you might want to look into getting a co2 reactor - better diffusion for sure.
How many bubbles per second do you run through your sera reactor and what ppm of co2 do you end up with?When you see a colour change in your co2 indicator bell, it's actually telling you the co2 concentration about 2hrs ago. They look nice, but they're a bit pointless imo. Pearling plants tell the story.
An inline reactor and an inline atomiser are two different things. An atomiser has a ceramic disc/barrel and you need high pressure to force the co2 through it. You need to keep it clean. Realistically, you need to own 2 so you can swap over a dirty one for a clean one. A branded reactor usually has a spinning wheel that smashes up the co2 in to the water (like Sera or Ista). Some reactors, like the home made ones, don't have a wheel. They are hardly ever need cleaning. I have a tank the some size as your and use the Sera 500 reactor. A reactor chamber is long and allows for better co2 diffusion. With a reactor you use less co2 for the same results. A reactor also reduces/eliminates micro bubbles from entering the tank.