UnitFarm UF2000 Trainwreck grow test

this week i got some great bud growth, i am having a pretty bad deficiency i'm guessing it's a lockout from not being sure exactly where to PH since it's a 50/50 soil coco mix, i definitely won't be doing that again and will be using straight coco from now on, it is late in flower but i will be trying to correct this deficiency and hope it doesn't affect yield or thc% too much, so far every bud is solid rock so i expect a very good yield with not so much fluff, i also think it will be done by day 70 so next week i shall be doing my finishing nute schedule then a flush the last week, side note this plant is gigantic and i didn't think the unitfarm would be able to handle it but it's doing so well i honestly think i'll be upgrading it and try out another full tent