Dont think of the veg. nutrients and bloom nutrients as seperate entities. They are all the same thing wrapped in a pretty bottle. It's just NPK with trance elements needed to aid the big three and keep the mix stable (this is way over simplified). A plant only needs 17 elements to grow successfully. All you need to do is bring them to the party at the right amount, at the right time.
You bring up the Trio in the next post. They are a wildly successfully blend that has been around for almost 50 years. I use it because of this lineage, and I guess I sort of "grew up" with it. But I don't look at it as a descrete veg schedule and a bloom schedule. There ARE transitions, in feeding, but they happen throughout the life of the plant with minimal impact.
I can't speak for someone who would advise another to use so much Nitrogen in bloom. Maybe he's a soil guy? I don't know. I will say that anyone can be a Mod though. I'm sorry you were given this advise, but this hobby is rife with heart ache. It's ALL one big learning experience. The take away may be that reading Jose Cervantes' Encyclopedia is in order. It doesn't go far into hydro, but its a fairly well rounded book on pot farming. Books from well renowned authors is never a bad idea. Although I don't like the book by Rosenthal used by Oaksterdam as a textbook. The internet is great, but full of misinfo. You need to learn how to pick through the bullshit, unfortunately that will take some time.
Let's say your using the Flora Trio. Start with the minimum dose... its pretty safe. Use a good
Calmag that isn't above 2 in Nitro (first number in the NPK) or find a Nitro free version. Grow More has one. Use a water innoculant, like Z7 or
Hydroguard (this is super important especially if your water temp ever goes above 73). Dont exceed 800 PPMs in veg., and don't go over 1200 in bloom.. And just go one season with it... get your feet wet. Get a successful hydro grow under your belt and then try some additives like monosilicic acid, Fulvic acid, Rapidstart, maybe a PK booster, etc. Don't use a ton of additives. Keep your meter(s) calibrated. Watch your water temp. You don't nessisarily need a chiller, I can show you how to cool water by 10 degrees with a fan.
I'm sorry you are having issues, but it does get easier. Wait till you get a bad case of root rot, or some other nastiness. That's when the learning really starts. Cheers!