Do you think adding more documents than requested would be a problem? Have you heard of any such incidents?
There are contradicting viewpoints on this issue on this forum.
I sent only what was requested but considering I'm a homemaker with no work or education history in my '4 years', I'm beginning to wonder if that was a right decision. (Too late to do anything about it anyway

). Reading about a homemaker applicant who was issued an RQ on another thread just went on strengthen my doubts.
I guess luck plays a major role in determining the outcome of your application.