I love scrogging sativa's I did the Ghost Train Haze #1 (90 day flower) scrogged and it worked out perfect. Just remember to keep tucking them under the net as they grow... If you know it's going to stretch for 4 weeks I'd keep tucking them until week 3 or so. This is MK Ultra x Bubblegum? Sounds like you have a 70-80 day finisher which I would think would only stretch for 3 weeks. The only thing to watch out for is stop bending too early, I've grown sativa's in scrog that stretched so much I should of had a 2nd net 8" above the first one to keep things from flopping.
If this is a Serious Seeds Bubblegum cross you can probably pull 2lbs!! I did a 4 plant under 1k (each in 5gal) and had 1 Serious Seeds Bubblegum in there, I pulled 8oz off the Bubblegum, 4 of those woulda been 2lbs!
What are you using for netting? I see some are like 1" squares and some you've cut to 2" (guestimating) squares, is that a prefab netting? I'm cheap when I built a scrog (orginally i drilled holes every 3" to run hemp through but said F that and just used the holes are markers and just tied hemp around my pvc every 3")
