Just an update:
Wow... Just wow...
The switch from PPI to EI has made the plants grow quite a bit faster and fuller, there is a lot more pearling of O2 to the point it streams to the surface. Things are finally turning redder - Still haven't mastered that yet
I had a couple of friends who don't own aquaria tell me the tank looks so much more lush than it's ever looked. They asked me what I did.
The switch to EI wasn't without bumps. There was a moment I had spot algae and string algae reappear after they hadn't appeared in months. A slight adjustment to light and CO2 did away with both. I've watched small patches of BBA melt away.
Thanks for your advice. I'm staring at the tank as I write this, it's never looks so good.