OK.  I am not aware of the history of the oil wars here.  (And every place has history...)  But I do know a bit.  JASO-ma and JASO-ma2 are safe for wet clutch.  That is the entire intention.  JASO-mb is not.  http://en.wikipedia.org/wiki/Motor_oil#JASO

North American Shell Rotella-T is well known to work well with wet clutches.  Outside of North America, stick with labels.

If you run oil with friction modifiers, it will permeate both the clutch material and the metal disks.  That is kinda the point of friction modifiers.  The fix is to replace the clutch disks, and scuff up the metal disks.  Rubbing compound on a sheet of glass is a good method.  Fine wet sandpaper on glass is another.