Digital BW, The Print

Hi,

i'm trying to get some A3+ (19x13) prints done urgently on Harmon Gloss FB AL paper using 
my Epson 3800 via the front manual feeder. I've tried using the rear manual feeder 
previously which works fine but i'm getting pizza tracks on the darker prints so i switched to 
the front manual feeder. The problem now is that the print gets chopped off slightly more 
than a 1/4 of an inch at the top and at the bottom.

My image size is 18x12 inches. Under the paper setup, i have a custom paper size set up to 
19x13 but with 1/2 inch borders all around. This works fine using the rear feeder but using 
the front feeder, the sides are ok (1/2 inch border on the left and right) but the top and 
bottom have a border of slightly more than 3/4 inch (i.e. cutting off my image at the top and 
bottom).

Appreciate any help as i've wasted quite a bit of paper trying to figure out what is wrong. 
Thanks!

Derrick