Oh yeah, wrong wheel...
Good point with the cams. These new GTX's just keep going and going up top judging by the maps. So it seems, like you're saying, that they'd benefit from the extra duration the S4's bring. I wonder what that would do for the bottom end tho.
And yeah, cam gears are a pain, especially the JWT ones like I (and I think you) have. They're superior since they'll never slip but they're sure a pain to adjust.