You might have bitten off more than you cared to chew on that one. I've grown this strain before and she was a monster. If you have to you can do alittle pruning and clear some space. If you want to grow again,,, lesson learned... If I ever want to work with these runaway strains,, best to work with clones,,, seedlings tend to get taller.. And veg under flouescent lights.. You can keep them real close to the starts and they stay shorter.. And first start of flowering like 10 days,, use your MH or veg light. Flowering lamps, HPS I'm not sure about LEDs but I know HPS lamps compound with the stretch run into taller plants.. But then there are so many strains to try out.. Myself,, I stay away from most sativas in tents. But it sure is a nice plant. And is great herbs...... You'll have a nice harvest if you can tame the beast.
GL and Keepem Green