1st Grow, try to get to harvest

Nothing major this week, just did a little bit of defoliating, topping, and tucking the odd branch under the netting. I introduced Age Old Organics kelp with the grow feed. Looking at previous pictures and I am unsure as to why the 2 NL are growing so slow while the SC seems to be exploding since I got her 3 weeks ago. Maybe it's the soil I transplanted her into as the 2 NL are in 2 different brand potting soils, this wasn't on purpose, I had under estimated how much soil I would need for 2 5 gallon pots and the garden store I bought the first soil closed for the next 3 days. I had ran to Home Depot and looked for the same brand if not then one that was close. My next run I will use Fox Farm's Ocean Forest as that's what the SC is in now. Next week I'm thinking of lifting the netting and giving all three a trim. I am extremely happy with the SC and she gives me hope as all previous plants have been growing slow or getting 1 inch tall and staying that size (happened in both grows). I have noticed that the seedsman NL has much thinner leaves than the 00seeds NL.