Sorry to interrupt, but I disagree that the robots.txt blocked /go/ directory is against Googles guidelines.
They do say (really talking about paid advertising links, but it should be the same, the whole page is about how to avoid passing page rank):
Quote:
Note that PPC (pay-per-click) advertising links that don?t pass PageRank to the buyer of the ad do not violate our guidelines. You can prevent PageRank from passing in several ways, such as:
* Adding a rel="nofollow" attribute to the <a> tag
* Redirecting the links to an intermediate page that is blocked from search engines with a robots.txt file
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Reference:
https://support.google.com/webmaster...er/66356?hl=en
I might be wrong since this is not PPC, but I cannot se it is much different? Corrections are welcome if I have misunderstood.