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If the switch is made from http to https (with 301 redirects from http to https) should the disavow file be copied over in GWT so it is also uploaded against the https as well as the http version?

We have an online site with approximately 800 products.  When we add new products we typically use the photos and product description provided by the brand.  The problem is there are numerous other sites using the same descriptions.  All other content on the site is original. Is having small blocks of content that are the same on multiple sites likely to cause problems with Google?

By selecting a country in the Country Targeting section of GWT what effect does this have? For example if I select UK will this boost rankings on google.co.uk and decrease them on google.com etc? If we are based in the UK but our customer base is worldwide should we not select anything?

Is there a way to find blogs with a high domain authority that are in a specified niche? For example is their a tool that finds high domain authority blogs that focus on tech?