I would say you have done just too much...
Put away you ph pen, you are missing some informations. The ph of soil is most likely a mirror of your feeding. If it‘s correct, your feeding is good. My ph of water is 7-8, that‘s not a problem with organic grows.
So the first problem was giving the wrong nutes. There wasn‘t even a visible bud, when you already fed tiger. So alot of unused P, which is changing the ph of the soil. Cannabis will need N in high amounts during the stretching phase up to 3-4 weeks into flower. Just look at all the green mass the plants are producing at this stage. If they are getting bright in this time, feed N. Bloom nutes are needed from week 3-4 on, when buds are building up. Big bloom seems ok earlier on (I am not used to the products, so I just looked up whats inside. I guess other people can tell you more).
Flushing destroyed the microorganisms, which are doing the job during a organic grow. So never flush. To build up bacteria you can feed some aerated compost tea (ACT), or add diatomaceus earth to the soil. Dolomith would be better than garden lime.
It seems the plants were overwatered alot, maybe also because of the flushing. Maybe you also need more aeration in the soil.
And I would add neem to the soil as pest prevention.