I had this, but a couple of months ago, google people manually crawling all over my sites - just at the time when my adsense earning were looking amazingly good for one site (now lost) I assumed they were loking at it because it had a very high CTR (without any cheating whatsoever). I lost one site with Bourbon and one site about a month later. All my other sites were untouched (as far as I can tell as they are quite new and are sandboxed as well.)
One site, the one that was doing well with adsense seems more heavily penalised than the other.
Do you have any hope that the penalty will be removed?