Links that you build manually on authority domains do not often require indexing. However links built automatically require indexation as they will often be disregarded or never be found by search engines.
Have you got any message on webmaster tools? If you were doing well with your tiered structure, you might want to consider resuming it to regain your rankings if your site isnt penalized.
Yes, Bing responds better to spam whereas Google needs a clean backlink profile. If you want best of both worlds, get huge volumes of high quality links.
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