My call is your vinegar isn't stable, so your water going in at 6.0... doesn't last long enough for the plant to take any nutes.
The run off coming out at 7, when 6 is going in... tells me that vinegar is worse than I thought OR the soil PH is also very high... and if that's the case, you'll be fighting that problem the entire grow.
My suggestion:
- get proper PH down and up, stop using vinegar. PH up and down have buffers to help prevent the effect from wearing off... that vinegar either is reacting with something in the soil, or burning off and your PH is going nuts(most likely high 8+)
- flush your medium with 6.5 PH'ed water, using 3xpot size (5gallon pot = 15 gallons of water). This will reset your medium and flush out nutes sitting there not being used.
If the flush doesn't reset that soil PH, maybe repot with a better soil mix. Changing soil PH is not easy, and typically "using better soil" is just the way to go. Over time(let's say this was a backyard), you can lower it by using compost. For pots, just use composted organic soil amendments (e.g. worm castings) to help buffer the soil at a more neutral level.
There are some other suggestions I would make, but you seem like the typical first time grower(like me
) and if I suggest it, you'll do it 10x over, and just end up killing your girls
One piece of advice I keep repeating in my head every single day.... "Don't over love your girls..."
I think you've over loved in the nutes, and under loved in the most important spot... PH!