Lemme know what the book says...it's possible those leaves are the ones that got the most dry when the pump was off they did get kinda hard and stiff just a thought but I figure I'm probably high on nutes as well...

so the first sign of over nute is some downward pointing leaf tips and moderate curving and then spotting or yellowing at the ends?

the bud at the top of Zola is about the size of a nickel now for some reference most of the rest are around a dime or smaller