Interested if you've got a write-up somewhere of the multicast issues you tracked down and fixed as I'm currently in a nearly-identical predicament with my home

Interested if you've got a write-up somewhere of the multicast issues you tracked down and fixed as I'm currently in a nearly-identical predicament with my home network, except I'm using mikroTik hardware instead of Unifi (ever since I mournfully retired my AirPort Extreme and Express's)