smithaa02 - 10:35 pm on Oct 3, 2011 (gmt 0)
One month would be fairly quick IMO to get a bump like this. I personally would be happy with a three month delay from a link building campaign. It's my belief that google sandboxes new links of sorts (they like older more stable links as they're harder to spam). You might just need to wait a bit more.
Now google does like fresh links (which is somewhat of a contradiction) but I think it is only for fast changing sectors (News/tech/that type of thing). Could be your sector that google has classified you as as might prefer older links over fresh links.
How is your link velocity? Have you gone from say acquiring 5 links naturally a month to say 500? It's widely suspected google keeps an eye on link velocity and factors this into the SERP's.
What percentage of your links are natural (somebody saw/liked what they saw from social and linked to you) and what percentage are from SENuke and artificial link building? If the latter this could be the problem as google is getting good at spotting this. I ask because I noticed your comment about varying anchor text which suggest to me that quite a number of these links aren't natural.
Also, I would be suspect of SENuke, although I'm not familiar with it, it sounds like a link building scheme that crawls the web looking for prospects, compiles fake content based on real content and submits this to patsy sites using a number of fake profiles? Correct me if I'm wrong... It does sound like something that would raise google's attention IMO...I'm sure Cutts is already familiar with this particular app.