You've got heat creep up the hot end through the heat break to the cold end. Filament is expanding and causing the jam.

The heat sink is not being properly cooled. That fan and fan shroud you've got there look to be only cooling (at most) 2/3 of the heat sink. It needs to have air flowing over its entire length or you will get heat creep.

Take a look at this fan duct for the E3D all-metal hot end. It fits snugly over the heat sink and ensures proper cooling over its entire length.

http://www.thingiverse.com/thing:354723