I've got one more question.
Do you adjust ph before or after adding nutes? Watering with 6.8 and having a 5.6 soil ph level suggests you adjust before you add nutes.
So your soil ph was more than likely even lower prior to this mornings watering.
I would put them back into veg and flush with a light nute solution adjusted to 6.0. You don't want to adjust ph dramatically. Little bit by little bit. How's your drainage?
Your runoff ph of your soil is your soil ph. Soil ph should be between 6.0-7.0.
6.3-6.5 is optimal. When you go outside of those parameters, your plant can't access nutrients and you get salt buildup or locked out. All the nutrients in the world will just make it worse.