Kermit, good day sir, well, i use Hamachi to make my flights with a friend, and works fine, just download it (and ask your friend to do the same),create a "new room" at hamachi, then you open FSX, (if you are hosting) Host a Session at multiplayer (LAN, the IP number that you will give for your friend, is the "HAMACHI ONE) And configure your flight (a/c, weather, location, etc), DO NOT forget to mark "Share My Cockpit" and to say to your friend that he couldn´t mark it, JUST YOU (AS HOST) after this, you should be at "Briefing Room" tell your friend to connect it and, he doesn´t need to choose an aircraft or nothing els, just "JOIN AIRCRAFT" and you should be ok to fly together.
About Carenado ones, i could tell that works fine, i didn´t test it on Bonanza, but Arrow, Baron, Seneca (including the HD generation, phenom, tbm, etc) works fine here!! Good luck and sorry about my english, regards from Brazil!