If you meet the requirement with your salary, why are you including your husband's income too?
Because:
A) if you earn more than £18,600, there's no need to even mention his income at all
And
B) he doesn't qualify under self-employment anyway because they will only consider a full financial year - so April 2014 to April 2015. He can't use any self-employment income from April 2015 onwards because that's only part of a financial year.
Also you can only apply under one category, so if you meet the requirements under Category A, then just apply under Category A and only include your employment documents and not his.
So for question 1) just don't include his income or documents at all
For question 2), that looks fine, just make sure your documents and letter meet all the requirements
For question 3), yes, just give details of when and where you attended the PEO appointment and gave biometrics.
For the 6 documents, they need to be evenly spaced over the 2 years - so one document in each name (one joint or two individual) for each 4-month period of the 2 years.
What dates are each of your letters from? If you have 2 individual documents per period they should have been issued around the same time as each other.
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