2nd partition on Fusion Drive - wrong size

Hey. I posted this issue on the MacRumors forums here ---> http://forums.macrumors.com/showthread.php?t=1500361 but I wasn't able to get it resolved.

There's an apple support doc stating it's possible to create one extra partition (Mac or Boot Camp) on the HDD but when trying to do so it won't partition the drive as selected in Disk Utility.

For example, if I reduce the new partition size to ~67GB it ends up being created as 250+ GB. I'm just wondering if anyone else has attempted to do this and what their results were.

Thanks