Something I have noticed in my own systems. My display is pretty nutrient rich. The hanna phos blinks "200" and nitrate is over 50 for sure, and every thing in that tank has exceptional PE, better than anywhere else here for sure. There may be some kind of connection between "dirty" water and PE.
like wise, I have noticed significantly reduced PE when my nutrients have bottomed out. Zero phos mostly for what its worth . How's your nutrient load in that system?
Now this is what I like to hear. A system making beautiful coral with high nutrients. After struggling with low nutrients for so long, my tank really exploded with growth, color and polyp extension with the addition of nutrient dosing. I'm nowhere near those numbers but I'd have to say, I agree.