9 months long enough to determine if 301 is helping?

I bought a domain for 2k that belonged to a popular movement, tons of natural backlinks from cnn, nbc, bbc.uk, etc…and the domain is local and where I moved I redirected the domain was for a page that aimed for certain cities, mainly that city.

I still haven't noticed rankings help from 301 redirects after 9 months…but it's a great tool for what i do is indexing articles quickly to compete with the same article on our other domain.

so should I just pull the 301 redirect and go back to…

9 months long enough to determine if 301 is helping?