Shape symbol in Padstack Editor automatically offsets

Greetings,

I am trying to make a 'c' shaped pad, per the manufacturer's recommendation. (https://www.fairchildsemi.com/datasheets/LL/LL4148.pdf)

For some reason, even when I put the origin of the custom shape in the middle of the vertical section of the shape (blue plus), padstack editor shifts the origin of the pad to the center between the top and bottom of the 'c' (red plus).

The problem is that when I place the pad this creates into a package symbol and then into a PCB design, the copper traces want to connect to the origin of the pad where there is no copper.

Any help with this would be very appreciated. 

Thanks,

Tyler D