Penguin destroys 1 of my sites! Any ideas why the other was spared?

[diogenes]

I have 2 main sites for my business. One is a creaky homestead site about 4 years old  Another is a much more sophisticated wordpress site now almost 2 years old. That site's traffic steadily increased until May of 2011 when it suffereed a 25 to 30% decline probably due to Panda. I did all of the recommended fixes with little effect until about 3 months ago when its traffic started going up again and had almost a complete recovery until last week when my traffic is down about 95%. I strongly suspecct the penguin. Interestingly, my old site has been virtually unaffectted even though bost sites are fairly similar, on both sites I started with a lot of directory links including DMOZ, Yahoo, BOTW, some strong lawyer sites like NOLO.COM, Lawyers.com, and others not so strong but I tried to get the best directories I could find. Then I started getting a lot of natural links but some of these aee pretty junky sites and scraper type sites.

I am curious if anyone has any thoughts on why www.uncontesteddivorce-nyc.com was hit so hard while www.affordable-uncontested-divorce.com  is unscathed. The newer site has, accoring to majestic seo and market samurai, around 35, 000 backlinks, while the older site has around 3500.

Thanks,

Paul