every other watering. Hi Brix will basically supplement additional nutrition to the plant besides the remainder of whats available in the media. It will allow for N especially to be broken down and taken up during the waterings in between. You should see yellowing in your fan leaves as you use it, and visible swells in between uses. In a 14 day flush period I would be using it twice, with a single very light feeding in between of readily available soluble Macro nutes (I use Bio Bizz Bloom).
So if you feed in the next couple days (and a good strong feeding at that).... and then follow up 4-6 days later with a decent flush (2-3x volume amount water as media, when media is DRY) to initiate the start of flush, then use Hi Brix (3-5 days later), then a watering with Bio Bizz Bloom (3-5 days later) (20%, or excessive, runoff), then Hi Brix again (3-5 days later), then a Full Last flush of 3-5 times volume of water to media (3-5 days later), and let dry before harvesting. That would put them right about at 9 1/2-10 wks right? One of the affects of SM is prolonged flowering...... GDP is typically a 9 wk strain, and SSH a 10 week strain.....
Every one does their own thing..... ^^^^ that is what my plants typically go through....... accept I give them even one more plain watering at the end (if I feel they need it, or could benefit from it
), and I don't let the pots dry out completely before harvest. I go by weight. Picking up the pot at the last watering I can feel the weight..... after a couple of days, maybe the day before the plant could be watered again, I harvest. I noticed the buds dry weights are slightly lower when I wait till the pots are completely dry to harvest, as compared to harvesting the day or so before when there is still some moisture in the pot. I always harvest at lights on as well.......
Your running a 1000W right?
And this is your first indoor run right?
And with the SM issues you had right?
Supposing they do well during your flush..... I don't see any reason why you shouldn't pull a lb or so, maybe more maybe less, out of it.....