Bluetooth Audio setup in Mojave problems

The sound settings in both the Audio MIDI setup and Sounds Prefs for selecting various speaker systems I have aren’t working correctly, and there doesn’t seem to be a way to split the stereo channels for 2 new individual Bluetooth speakers, not to mention the signal is severely degraded to all but one set of USB speakers, the Bowers & Wilkins USB I use most are all that work correctly right now. The internal speakers are also not getting a clean signal, and when I try to set up an aggregate device to combine speakers it gets crazy. This is since the Mojave upgrade, I had it working properly previously. this came about today when trying to connect new Bluetooth large 15” studio monitors wirelessly. Their signal is mixed to mono and too dirty to listen to as well as too low in volume. I can’t think of anything else to try. I've looked at everything and I can't be the only person trying to do a professional audio setup in Mojave and I see no community answers. Maybe the new OS screwed something up, my other USB setup is from a device that has 3 possible connections showing in Sound prefs, one is just the name of the device, which has always worked for stereo out, another is USB 1-2 In/Out that used to work but isn't now, and USB 3-4 In only that's now actually sending output through the device, which should be physically impossible. Is this a new glitch in the OS or something else? Thanks for any ideas, I'd like to get the new Bluetooth working, and I don't even see a way to choose a right & left for each BT device, although both apps see them and have them numbered 1 & 2. Weird.