I tried Matrix/Riot, but I ran into some big UI issues trying to get a E2E channel going between me and a friend (I had to "create" the channel multiple times,

I tried Matrix/Riot, but I ran into some big UI issues trying to get a E2E channel going between me and a friend (I had to "create" the channel multiple times, or add keys multiple times, I can't remember). And we share screens a lot, which Riot didn't seem to support. It was a while ago, but I also seem to remember delayed messages. The audio quality was nice though.