I agree with you mate. But I believe in PK boosters, but most definitely it require a very close eye. I am no expert but I did better my second round than my first. First one got burnt a lot more.
BTW it is interesting that bloombastic doesn't cause a pH drop at all. If anything it helps me raise my pH to 5.8 from 5.4 after adding the bases.
Also I don't think PK boosters should be added right at 12 12, that would actually hinder the yield. A boost in the final weeks can sure go a long way. By that time a bit of leaf discoloration is normal any ways.
Although my leaves look a bit fucked, I am most concerned about the bud, the bud has packed on like a mofo this round. With all the boosters, it is impossible for all the leaves to stay healthy, since all these additives along with its own natural cycle will cause the plants to divert their energy and focus on the buds instead of leaves.
After all we are harvesting the buds. That said, every grow my goal is to keep the leaves as healthy as possible at least 2 weeks till harvest. Hopefully you won't see any burn next round.
I like these friendly convos, they can help me clarify a lot of issues, even things I already know.