Learn to tell what your plant needs. What's good for one grower may not work for others
I agree with you on this, yet I would also add: What's good for one STRAIN may not work for others.
Thy I think this is a combination of a few things. Firstly, as ugorg stated, looks pretty heavily overwatered. Second, I'm sure somewhere along the line it's possible you saw someone using Maxibloom in veg, but I don't think it is a good idea (my opinion). Third, I would suggest making sure the drainage in your containers is substantial enough, don't be afraid to let the soil get dry, just don't let it go too long once it does. To be honest though, at this stage you could -get away with- using just ph balanced water and some plant food (I use miracle grow organic liquid plant food in veg).
Also, don't assume that because one dosage of nutes works for a certain strain that it will be good for a different strain. For instance, your Auto Berry Bomb might love all the nutes she can get, where as your Auto Purple might be very sensitive to anything but minute amounts. Don't be scared to mix 2 batches of solution (one for each strain). In my experience, a lot of purp strains are sensitive to the amount of butes you give them.
