Random flickering longer away from controller

[breese]

Run a sequence or RGB test on your display.
While running, use a volt meter to verify voltage at the outer areas having issues.
If less then 11+ volts, you need better power injection. Possibly a supply out at those area's.

[foremore]

Alright this is solved!

I was overthinking when and how to connect the V- at the controller box. I connected it wrong and it generated a lot of feedback that I managed but didn't fix. Once I removed the common v- loop I created everything corrected.

I added a common v- cable right after the controller to a v- bridge to the other v- from that port and then back to the lights... after removing that single wire to the bridge and having the v- directly from the controller to the lights everything works great now.