Is there any way to fix the weird facial distortion you get when you facepose a TF2 ragdoll in TF2?
Yes, by not using presets.
TF2 ragdoll's faces have different muscles than the HL2 ones. HL2's are based on real muscles, while TF2 ones are based on word sounds.
So, just use a narrower range of values when adjusting the face poser sliders?