What would you do? Some EMD mns and an Authoriy site on same niche.

Hello Dear Mates,

What would you do ??

I own a Piano shop in Brazil and one of my most targeted services is XXXXXXXXX (as told by Harry911 - Never reveal your keywords on a black hat forum !). The shop site is an authority site, ranking very well on many Keywords, also i have a lot of EMD MNS as follows.

For the Keyword XXXXs in singular and XXXXXp in plural this is what happens since last EMD update.
Shop site:
XXXXs - Google Brazil - 6 (used to rank n.2)
XXXXp - Google Brazil - 3 (used to rank n.1)
EMD MNS 1 (6 articles)
XXXXs - Google Brazil - Unranked (used to rank n. 6)
XXXXXp - Google Brazil - 9 (used to rank n. 6)
EMD MNS 2 (12 articles)
XXXXs - Google Brazil - 7 (used to rank n. 5)
XXXXXp - Google Brazil - Unranked (used to rank n. 3)
EMD MNS 3 (20 articles)
XXXXs - Google Brazil - 5 (used to rank n.4)
XXXXXp - Google Brazil - 5 (used to rank n.5)

What would you do?
1 -Keep adding content to the MNS.
2 -Transfer all the articles of the EMD MNS 1 and 2 to MNS 3 and redirect with 301.
3 -Transfer all the articles of the EMD MNS 1,2 and 3 to the Shop (authority) site and redirect 301.

Thank´s in advance, and regards from brazil.