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Injecting addition Power in WS2811 w/ E682

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Hi everyone, first of all thank you for all your help!

I'm almost done doing my LED Wall project. I ran into some general Questions.

My Setup
- 2x E682 Controllers
- 4x 5V/350W Pixel Power supplies
- WS2811 LED strips

First the E682, what's the theoretical max pixels I can put on the controller? Sandevices list 1000 or so pixels (So 90 pixels on a 5m strips 30 diodes on strip)
I've noticed you can put persay 500 pixels on each of the 4 output boxes (2000 total pixels) in the HTML config page. Is that doable if there's power for it?

My question is:
1. Could you go past that max?
2. If there a way to drive those pixels like injecting pixel power like with a ECG-PPI-A

Also off topic, I've noticed also going past 6-7m mark on a string full on white (RGB ON) pixels tend to dim out to a yellowish/red. Would the ECG-PPI-A work with injecting it with more power and how would I wire it? into the existing string?

Thanks in advance for anyone that could help!

I attached the setup I'm doing, I plan to add 2 more horizontal layers from the zigzags.
Attached Images

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