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I have blocked the Wayback Machine for a client and not allowed them to index the site. I blocked them via the robots.txt and not Meta NoIndex, and while blocking Wayback Machine it did NOT impact the positions within the targeted Google results.

Hope this helps.

Nice! Good to hear. Once you segment the those keyword you should see a boost. In regards to the trailing slash.

in most cases domain.com/test will also render at domain.com/test/, the root domain is not as big of a deal, but when you get into the sub folders is when you start to have issues. You will also want to keep an eye on domain.com/test/, domain.com/test/index.html and any other variations that might load the same content. These will all look like duplicate content to the engines.

Let me know if this helps. Otherwise I can send you some examples.

Perhaps the bigger question is: why are you not segmenting your keywords for these pages?

I sounds like you do have duplicate tagging and are not utilizing the additional content to target additional terms. If you leverage the hierarchy of content, cross link, and tag appropriately you will avoid any negative affects.

Anther thing to look at as well, is the trailing slash on the URL. This is often overlooked and could cause even more duplicate content.