Well I found the answer myself.

Turns out, many people who use Bushmaster get Rams horn from over nuting with it. I can't seem to find WHAT specific nutrient causes it. However, during the time you have the symptom, you also stop or have slowed bud growth.

Only answer I could find is mild flush and lower nutes. Then keep nutes a little lower after recovery!

So, new question is,.. What nutrient causes this? If I can figure out WHICH nute causes it, I can reduce whichever of my nutes contains that.