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But do you not think that marketing this keyword any more would damage the domain, and that I should concentrate my linking building efforts to domain and brand for a while to even out the percentages. Because replacement keys is far higher than the domain with the amount of domains linking.

No one can give exact idea about it. I prefer Compare Link Metrics functionalityavailable in Opensiteexplorer to compare my website with competitors website because it gives me idea about where my competitors are doing better than me.