If you're using leadcore, it will sink approx 1 foot deep for every 6 feet of line out...using 18lb core...1.9-2.2 MPH...so theres no need to use split shot....If the trout/salmon are all on the surface, I would deploy a few inline planar boards 100' back with spoons....flatlining also may be beneficial too...just let out 100' off the back with rapalas or spoons as well...I wouls run the leadcore down the chute (middle transom)