Good of TT to raise this whole topic.
I'd say it depends on the type of shot. If it is a putt with the slow Daytona, I'll follow the bar all the way over.
Same with a partial shot, which is in fact the hardest shot on this game but crucial sometimes to get the ball close. (BPB 17, usually, for some reason.)
Otherwise, if it is a full stroke, especially with the uniform meter speed across the main clubs (G10s and Ping wedges, for example), playing a pretty quick ball, I'll follow the bar about halfway and then switch my eye over to the line. This ultimately relies on instinct and habit of dealing with a uniform meter speed. Substituting slower balls, which should in theory be easier, wreaks havoc with this system.
The only 'swing thought' for me is a sense of which side I should miss on if I do end up missing the ding.