My rigs have generally got shorter and shorter over the years.
From feet down to cm's.
Short 2cm Flouro Chod Rig. Deadly
Long 30cm Armourbraid or Mantis(partially stripped) with shrink tube hook extension Knotless Knot with a fine hair blowback stylee. Also deadly
I don't know it depends on how I feel and just a little bit on conditions, location, the bottom. How I think the fish are feeling/feeding etc
and on occassions because I've read an article on a rig and just had to tie it and try it.
I am reassured, Mantis is cool, gets my vote out of that little lot.