Leading willows, specially small ones, do tend to be lazy. I will defer to others with more experience building spinnerbaits on the specifics as to why, as I haven't found definite reasons for it, but what I've found is that a wider and or deeper cupped willow will spin better, the spacing on leading willows is more critical, and the angle that the spinnerbait runs also has a bearing (pun intended), also anything overlapping the blade, including the swivel split rings and the loop it is attached to can interfere with the spin, as willows spin closer to the shaft than other blades. Lastly the size of the clevis, and bearing bead seem more important than other blades. I am not a huge double willow guy, but I'm starting to warm up to them in more situations than just burning.