tedster - 3:04 am on May 8, 2013 (gmt 0)
Yes, the double-reverse googlebot IP lookup is extremely valid today ( see [webmasterworld.com...] ) but that is only if you have a true proxy server going on. I don't think you do.
A proxy server just serves a copy of your files, passively. That is, the proxy server does not actually hold a copy of your files. Since you say that your files are being changed, the server that is outranking you sounds like a scraper server. The solution you need probably falls more in the area of a DMCA take down request, either tho their ISP or to Google.