Current medium is soil based, this isn't my medium of expertise since I a hydro person myself. I believe that yes the plant is potentiall rootbound; however, I have never before seen a rootbound plant act in this fashion. I have given thought to a potential K deficiency and have added Calmag to my nutrient administration since it contains both K and MG. I'm very much in doubt of overferting since I've been growing in a Miracle grow medium for the last two months and have added nothing but straight 6.5 ph water with no nutrients up until two days ago when I added cal-mag to the water treatment. My PH soild run off is approximately 6.3 which I believe should be ok, if not pls comment.
I just find it odd that these spots only presented themselves two days after taking 100 plus cuttings from this plant (I really butchered it but left the main to sex it). and moved it over by the CO2 generator (using CD6), i could be wrong but it just seems that there must be some connection to this event since for two months before the NYC Diesel looked incredible through veg state, best plant i've seen in 5 years in veg state. The plant is still very healthy on newer growth. Due to height restrictions we are only 3 feet from top of plant to a 1000 hps on a light mover so it doesn't get too hot, but I will admit that it is close, not too much I can do about it unfortunately. I'm with you on thinking K or MG deficeicny thought.... any thoughts?