awesome work!!!!!
congratz on ur desing and ur amazing build !!!
hope u get a nice harvest.....
about that plant, someone mentioned before the fenotype...well fenotype/genotype its a tricky things, prolly needs a little more cuz as u said is giving the bigger flowers. maybe u can find a way (im sure ull do!!!) to just give the cal/mag to only that one ,so u dont mess up the development of the others, in others conditions maybe let it be, but ur in the middle of ur flowering time so, well is up to you. but anyway the best advice is : think it carefully un trust ur guts!!
good luck man