Welcome to the LED RFI world. Been telling folks about this every chance I get. Surprised you haven't seen some of my remarks haha... My other point I always kept passing along was to only buy ONE and try it out first haha... Wonder how I learned that... I have posted alot of this info ever chance I got - about as much as seeing everyone buying high dollar generator sets to run their air conditioners only to find out everywhere they go the camp sites have generator restriction hours and only allow a couple of hours a day of generator run times. Sure can't cool down when you are not allowed to run the generators haha...
Good luck with a fix... The FIX is playing with ferrite beads and special VERY SMALL strip-line capacitors soldered in at varies places. My RFI was worse when I was using the crank-up OTA antenna camping off the power grid. It also killed my HDTV reception, my NOAH WX Radio reception as well as reducing my Ham Radio/Police Scanner receptions. I gave up on fixing mine and just replaced the dual light fixtures with the cheap NON-REGULATED Ebay/CHina $4.99 boards. They work just fine and put off very bright WARM LIGHT. The non-regulated type boards operating specs is 12VDC to 14VDC and some guys feared the life expectancy may be reduced. My highest DC voltage coming from the Converter is 14.4VDC but some converters will put out over 15VDC doing their scheduled battery maintenance operations every 24 hours. This might be too much for the LED BOARDS I have. My Ebay/China boards have been going for several years now and I have lost one three LED segment in one roll in only one fixture so far. I bought many spare boards and if it gets to dim to use use then I will just change out the bad board for another new new. $4.99 is not a lot of money hehe...
Still some others installed a different three position switch in their DUAL Ceiling LIGHT fixture (or changed it out for the individual ON-OFF switch for each side models)where it would turn on ONE-OFF-BOTH lights. They left their high dollar regulated type LED board in the BOTH position and installed the cheap $4.99 LED Board in the ONE position. This way they could leave the fixture ON without using the regulated type LED board when watching HDTV.
Also you can't go back with the various LED manufacturers on this problem. They are within FCC specifications on how much RFI they are producing. Most LEDs providers just won't tell you about it until you ask...
Sorry you having problems with yours...
Roy Ken