Hello Craig,
The issue with RadScheduler export to pdf when width is set to 100% is a known one. It is logged for fixing by our developers. Till the fix is done, the only workaround is to use width set in px. I will notify you in this thread when there is some update about the fix.
Please, excuse us for the inconveniences caused by this issue.
Regards,
Aneliya Petkova
Telerik