Why stack at all? Stacking is a pain in the...

If you must, take Sky Guy's idea and run with it. Also, loosen the tension up on the trolling snap by bending it back slightly- problem solved.

If you want to run the double snap, cut off one side and replace with a 5-foot (or to your liking) piece of mono...
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"If you are not scratchin bottom, you ain't fishing deep enough!" -DR

Puget Sound Anglers, Gig Harbor Chapter