Look first at the sea stim...a huge dose of kelp. That is the key. It manipulates hormones...think what jacked up insulin does to you. It pretty much assures you that cytokinins become dominate over auxins.
This prevents true stretch...node spacing increasing provided you have enough nutrtional support. The sea shield.
Having luxury levels of Mn signals the plant that it has what it needs to make mucho seed...so it sets lots of bud.
But the main key is manipulate those hormones. Without that the rest won't work.
Just my guess though.
Btw...coot has pointed out sprouted corn seed teas are also powerful cytokinin manipulators
I honestly have no clue how pgrs work...never had any interest.
If your height comes from wider node spacing then yes...it will keel them shorter. But if you are providing enough food...energy...they will continue to grow vigorously.
Sorry I don't know the exact answer
You think an auxin imbalance is what causes fox tailing?