Living soil but I think my plant isn't getting enough nitrogen. Also is the plant budded ready or let it go 2 more weeks

It looks more like calcium issue with the lower leaves spotting but that might just be old growth as calcium is not mobile and the newer leaves look fine. I do not think its nitrogen because Gaia gree Nitrogen contest is readily available and I almost always have issues with to much N when I use this amendment. have to mix it down with bloom and grow not just grow. The golden edges on the lighter coloured leaves does look like potassium to me and Gaia green has some but not always enough readily available. It also lacks Magnesium so some epsom salts are needed to boost the Mg content once a month. The top cola leaves curling are a sign of heat and or light stress. will want to increase airflow and raise lights up a bit. Best Of Luck!