From what information you have given us, I think they don't have a problem with your relationship and the statutory declaration is just standard.
The complete Schedule A is beginning to become standard, also. I was also asked to give a complete one, even if I've sent them the one for the last 10 years.
As for de medical and police documents, that could be a good sign - they could be ready to advance your file in the next stage of processing.
My advice would be not to freak yourself out and just send them the documents

And hope for the best