I also have a pair of 20s, Garmin 590 and IPhone 6s.
The only different thing than you described, my phone and gps do not link.
Phone is for music, receiving a call, or nav if I'm lost and gps is not along.
GPS is just for nav if I took time to plan a route.
Rider comm to passenger and to other bikes works. I was going to say update but you did - are you aware that as the software is updated the manual becomes obsolete, best to check the online version there too. Sorry can't help other than to tell you it can work.