Update - I've tried everything and still no live video in C4 devices, only static images. Here's what I tried:
Tried using lower quality RTSP streams without success
Tried making my Unifi camera a standalone camera, connected to the camera directly and tried all the different RTSP streams without success
Pretty much fiddled with every single setting one by one in the NVR, the standalone camera, and Blue Iris without success
So odd how everything works in Blue Iris and in the C4 mobile app but it just doesn't work on C4 devices. Crazy! I have no other options at this point.