WS2812B LED flickering, not a power issue

[Deva_Rishi]

@djpletcher

I redid everything with 22awg stranded wire, which I had on hand and which is the size the original wiring). I had been using 20awg.

28 AWG is even better, though getting a bit fragile.
You can also use solid cable of a thin gauge if the installation doesn't move.
Less surface is less capacitance.