BLUEBERRY + NORTHERN LIGHTS 14WK SCROG

Sorry to have started this so late. Wish I'd done every week. Can't wait for the next grow. This is almost my first grow and I made a whole load of mistakes. The main thing that happened was that after 12 weeks of veg they outgrew their tent so I had to leave them in a dark room for 4 days until the bigger one arrived. Every leaf went yellow and look at them now! Needless to say I love them like my own children! Total survivors. The blueberry smells so much like blueberry hard candy it's crazy! And the Northern Lights is so white and frosty. I know it's a bit late in the day, but if anyone's got advice on 1) making sure they don't get mould in their final 10 days. 2) Should I upgrade my P1000? 3) What strains should I go for next? I'm a philosophy lecturer and I like a nice creative high early evening, and a non-paranoid comatose high when I go to bed. 4) About EC. Er...confusing eh? So, if I feed with 1200 and it comes out 2000, I need to lower the feed until it comes out 1600? And if I feed at 1200 and it comes out at 1400 I can increase? Right? EC seems to be one of Google's achilles heels. I have to say, this is the best hobby ever! I love it so much. I did one auto grow with Jack Herer and OG Kush both of which picked up a bit of mould, probably because they had to share a tent with the other ones and the humidity was 80% most of their lives. Have to say, OG Kush too strong, Jack Herer, absolutely amazing. I've never had a smoke that pulls me immediately into a good mood. Usually it just elevates whichever mood I'm in. Can't wait to do another grow of this that I don't pull two weeks early! All the best and I think you're all brilliant.