Thanks for pointing this out! I added -webkit-text-size-adjust: none; recently as a global to fight some iOS webkit weirdness. Using some @media query magic to target this is the right move. I will get this into an upcoming release.
BTW, if we have not yet been "formally" introduced, my name is Erin and I am one of the Interaction Designers on the team. Feel free to send anything else like this my way via PM or erin AT shapeways DOT com.