I agree PDF XChange Editor is the best for stress markup. Commenting is very easy with it.

Mr Edward, i understand from your comment that there is very organised set of stamps use is being made by you.

I do use my set stamps is Xchange, but are very limited to few sets of notes for Civil Loading, X mark for support locations in 3D snapshots from & XYZ coordinates.

I was anxious to see your set of stamps, could you please mark some to blank pdf and attach to reply? if it is okay with you.

I wish to organize mine & set a procedure.

Amit