OP, maybe this will help.
This is my Fox Farms feeding regimen, my veg recipe is:
Batch 1 & 2 Per 2 Gallons Water - Veg:
• 2 teaspoons Cal Mag
• 2 teaspoons Grow Big
• 1 tablespoon Big Bloom
• 3 teaspoons PH Down
• Add more PH Down as needed to PH = 6.50
When watering 4 plants in 3 gallon fabric pots, I use 1.5 gallons per plant, or 6 gallons each watering session.
I will mix the first 2 gallon batch, water all 4 plants, wait 30 minutes to soak, then mix batch 2 of the same recipe above. Water, wait 30 minutes.
I then mix a 3rd batch of "plain" water as follows:
Batch #3 Per 2 Gallons Water - Final Runoff:
• 2 teaspoons Cal Mag
• 3 teaspoons PH Down
• Add more PH Down as needed to PH = 6.50
I am using Fox Farms Happy Frog medium. Be careful with the Big Bloom, I use it every time I water, but I never use more than 1 tablespoon per 2 gallons or I risk damage to the plants, confirmed by trial and error.
For the flower cycle, I use the following:
Batch 1 & 2 Per 2 Gallons Water - Flower Week 1-2:
• 2 teaspoons Cal Mag
• 1 teaspoons Grow Big
• 1 teaspoon Tiger Bloom
• 1 tablespoon Big Bloom
• 2 teaspoons Humboldt Sweet and Sticky
• 3 teaspoons PH Down
• Add more PH Down as needed to PH = 6.50
Batch 1 & 2 Per 2 Gallons Water - Flower Week 3-6:
• 2 teaspoons Cal Mag
• 0 teaspoons Grow Big
• 3 teaspoon Tiger Bloom
• 1 tablespoon Big Bloom
• 2 teaspoons Humboldt Sweet and Sticky
• 3 teaspoons PH Down
• Add more PH Down as needed to PH = 6.50
Batch #3 Per 2 Gallons Water - Final Runoff:
• 2 teaspoons Cal Mag
• 3 teaspoons PH Down
• Add more PH Down as needed to PH = 6.50
During flower, I will alternate between 0 Grow Big and 1 teaspoon Grow Big, and drop the Grow Big entirely by week 6. Also maintain the clear water batch #3 for final runoff during flower and veg, this is critical to keep the roots flushed out and free of salt buildup.