Proofs that you provide is never enough, they can ask you for anything anytime. I don't know if you had a chance to read that one of the family members of 'became-a-loner' had to do their rukhsati, and walima pictures again with their son on their lap and provide those picture :-\
My wife's case was very simple as well, no work history, no travel history, only education, lived at one place since birth and we have no kids, she didn't receive any objections, nor she received any request for extra documentation yet It took them 19 months to process her case...