Oculus Quest 2 Link (with wire ) using oculus runtime has jittery head position - but only in straight Oculus mode - no problem if using SteamVR. Am I missing some setting or do you have the same problem?
Seems to also be a problem with Q2 w/Link in xp11 as well. The workaround there is to run it through SteamVR like you've found out already. Maybe something that will be fixed in the next Oculus update.