Looking at those pictures shows high nutrients. (Note how green past death is)
Not sure if your hand dosing or using pumps, but one pump may be dosing more than the other explaining the difference in uptake. I can't think of a time where I had uneven dosing using an a&B Product or BRS
I personally prefer keep it simple Berlin method, but barebottom if I'm SPS focused. I shoot for almost undetectable phosphates and nitrates, 50-100x flow(you are a bit short), big skimmer, and lots of light(read this as 350-500 par), 10% waterchanges weekly. Dose nothing but alk and cal and maybe mag if necessary(I find it's not with 10% wc).
If I'm having issues I generally dilute the problem with 25-30% waterchanges 3 days in a row. Use a salt that mixes where you plan to run your tank. I attached a pic for growth reference when things are going well for me.