Digital BW, The Print

My MIS setup for my 880 showed up today along with a bunch of paper. I
ordered some Somerset Velvet and I'm unable to get the printer to feed
it. The Epson Archival Matte goes through just fine. Is this common
with the Somerset Velvet and other papers in the 17 mil thickness
range? Or is there a trick which would let me feed it through? Is
there a threshold under which I'll probably be safe?

If not, I've got a pack of Somerset Velvet someone can have for cheap
(no shipping if you're near St. Paul, MN).