That's lame. Sorry to hear; I'm sure it is incredibly frustrating.
Personally I have avoided this problem by enlarging my ass cheeks through a steady diet of red meat and sweets, such that even when I am riding the Speedie my coccyx is nowhere near to bottoming out on the seat.
I hope they come up with a solution for you. If not, I suggest this method:
http://www.youtube.com/watch?v=ls5nW_10OSs
