I had 3 extras of those big ones so I was able to leave the 1 there in the inverter and put the others in the AC mains panel where that same inverter line enters it. Its maybe 8 ft total of cable as they are almost directly next to each other. I was able to get all 3 new of these big clamp on ferrites around all 4 conductors as well.
The buzzing is not as bad now but theres basically zero power going through (heavy clouds all day) right now. so the buzzing is really at a min. Cannot feel it but can still hear it if I put my ear close enough. Also the RFI trash is still there albeit subdued, but thats likely due to the low solar output instead of the new ferrites.