Those are no where near done . Calmag is not the best for plants that late in flower. They are gonna start to lose the bigger fan leaves. Don't fight that or you will end up with over ferted nasty tasting bud. Ride it out . There are several bloom boosters out there but you really don't need them. You have atleast a couple more good weeks of flower to go. They will put on most of there weight in the very end. You said 2 more waterings which will be probably 6 days at most. Go like 4 waterings and then flush for atleast a week or more and they will be done and that is on a 8 week strain. I always go a week past what the plant is supposed to go. Unless you have the strain dialed in and know when it will be done exactly? That is my opinion based off of the pics . They are a long ways from done . They look very nice !!