Bjorn,
Joey and I have struggled getting the Shad dialed in but our success increased when Jeff Cheng showed us his flies. It's called the Bloody Maria and you can search Kienes for more info. Here's one of Joey's ties. We have only used these on the American.
Hook: 2457 sz 8-10
Tail: White antron with 2 strands pearl flashaboo
Body:Red, Blood red, Orange & Chart floss or thread
Rib: Chart wire for reds & black for others try silver too
Head: White thread ball or use White painted beads
Joey used a brass bead with a thread head. Red and blood red have been my best colors.
Good Luck,
Jet