For Soldier melee weapons the escape plan and the whip are the only ones worth using(besides stock) because they either make you take more damage,make you only able to use that weapon, or are just completely obsolete. For nerfing the non-obsolete ones here is my suggestion:

 

The Disciplinary action:

Change the -25%dmg to -35%dmg (to make up for its ridiculously long range)

-5% or -10% move speed while active

 

The Escape Plan:

+15% damage taken while active

do whatever the fuck you want with the healing i dont really care