Interesting observations

Try using part of a suspend strip on the hook shank in different size pieces
to make it fall flatter depending on the rate you want it to fall.It looks
more natural that way. (me thinks anyway)

I can see someone wanting a senko to fall flat, but is it not the erratic
action of the fluke and other soft jerks that draw more strikes? The slight
spiral, nose dive, turn-up, backward tail dive, etc., that gives it the look
of dying prey.

I personally twitch them, pause (where during the pause they may suspend and
then do a nose or tail dive or they may glide in a spiral, etc.) My
favorite is Mann's Shadow Minnow (pearl white/black back) using a 4/0 hook,
20-pound mono or Fluorocarbon in clearer water, and a 6'6" medium, fast
rod. Rarely to I let them sink deeper than 9-feet, even in gin clear water.
Typically I work them just above the weeds and may let them settle just into
the seed tops before I twitch it into action.

--
Craig Baugher