There is no set length or Rule of Thumb that I know of for spoons. Everyone has their own liking for length behind the flasher. My preference is 42" for Blackmouth- measured from the end of the flasher to the end of the spoon. Larger spoons (5-6 inches) I'll move it out to 50". I rarely use the 'yote anymore because it doesn't glow bright enough for me.. I like the Silver Horde spoons. But that 'yote it is one deadly spoon. My leader choice for spoons is 20# Maxima- nothing else!

Downriggin'
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"If you are not scratchin bottom, you ain't fishing deep enough!" -DR

Puget Sound Anglers, Gig Harbor Chapter