To be honest, I don't know. Maybe someone with a more technical background can chime in, but to me it seems that carbon dosing is typically used to fix a problem with an established tank... high nitrates, sand bed issues, old tank syndrome, what have you. Your tank doesn't really have a problem, it's just teething. With your obvious attention to detail and excellent equipment selection you'll be back to low nutrient levels in no time I'm sure.
Artificially modifying bacteria populations at this point in the tanks life feels like a solution in search of a problem you know? hold on and ride it out!
on the other hand I'm sure carbon dosing right now isn't going to ruin anything, it might speed your tank along, IDK. It just feels, well... meh.
EDIT: just realized this is the first time I've posted in this thread. Forgot to give the obligatory compliments =) I've been following your build from the beginning and it is hands down one of the most well thought out systems I've seen on RC. Very well done. Can't wait to see the tank mature and I'm excited to see how you implement the refugium setup, it will be top notch no doubt. Thanks for bringing us along with you on this journey!