Looks to me like iPhone Retina has two issues which work better
1) Use default btn for class = “btn” btn-lrg quickly runs out of room on a Retina device.
2) Also seems that staying with the default Main Content Area Text Size of 0.813em works best for iPhone Retina displays, I want to use either 0.938em or 1.00em and that seem to make the text too big on the iPhone Retina – not on other phones of the same size with normal displays including earlier iPhones.
Do you use 0.813em for the Circumference demo?
For now I am going to reduce the font size for blog.StopJetLag.com – (Will hold as is until noon PDT)