1200 poms of what? How long did you veg for? And what lights are you running? I ask you I also have some gsc going atm I'm about week 4 into flower. Just starting to swell. They look good though hard to get an idea of what going on with the blurple lights.
Ok so the ppms are at 1200 because I use down to earth 284 bloom plus I add 3 ml of fox farm tigger bloom every other week along with calmag and molasses and I'm also got a 50/50 mix of fox farm ocean forest soil mixed in with coco coir. Now as far as lights go it's a 2'000 watt king's plus led and veg time was 1/1/2 months but the gsc strain says it's a 10 week flowering strain