Keep looking at the psj servers. I've charted my server connections and confirmed the problems every single day since I've noticed them, and now my observations about that particular line of servers is being corroborated by a number of users.
Please note, when I say lag or swing meter stutters, I mean all
of the symptoms you described above: Hesitation/freezing in the backswing, jumping meter on the downswing, occuring multiple times per hole, even with swingthrough. These swing meter issues occur no matter what type of game is being played, CTTH, single player, or multiplayer. It also matters not what time of day the server is being used, these issues occur around the clock with the psj line.
The problems may or may not be connected with the problems I listed in this
thread. They also occurred on a psj server.