hi McDanger
let me say first that i'm no expert and Stinky knows way more than me about all phases of growing.

at the same time, i'm a little confused as to why added nitrogen in the bubble cloner solution is a bad thing, they only stay in there until they are rooted.

i've been told also that the one thing that Superthrive is truely good for is for promoting root development.

(the ThriveAlive B1 Red is supposed to help with root developmet as well)

as i said, i'm no expert and there are several ways to clone.
that being said, i love my cloner, since i built it, only 3 of my cuttings haven't rooted.