I have 90 websites all in legal niche on the same server, including the same server as my money site. Currently I am using the other sites for PPC, all about 5-10 pages long with content from 2011. Backlinks and DA are not bad. Is it too late to use those as PBN? With getting private whois and moving them to a different server? Or should I use those 90 sites to point to tier 1 links (avvo, lawyers.com, nolo) Sorry for noob question.