yeha you haven't uninstalled all the animation replacement files. you'll have to check through every single file.
I don't believe RH_Ironsights changes any animations, and I really have no idea what you mean when you say your actors are 'bending'.
All FO3 weapons are able to handle the look-down-the-sights view, but many are not properly aligned to the sights.
All Ironsight mods (Like RH's or Alexscorpian's) do is move the model using nifskope to ensure the view properly lines up.
I don't use RH's mod, but I do use Ironsights view for every weapon, as I feel its more immersive
If you dont want to use this view, then use the GECK to enure that the 'Don't use first person animations' box is checked on each weapon.