I don't want to necessarily divert this off, but if you're looking for conversions, your backlinks need to reflect the focus of your money producing pages.
If you can document that Google is "clamping" meaning that other engines provide consistent results, but GG shuts off on some given hourly/daily timeframe, then there is something to talk about.
Not getting signups/conversions is one thing.
Not getting traffic is another thing.
Zombies might be different, but often have correlation.
The general "I deserve more Google traffic" thread might be more appropriate for your post.