When I am looking for PBN domains, I am finding a lot of expired domains that looks pretty good - they weren't SEO-ed before nor used in a blog network. These are mainly domains that droped just once. The backlinks they have are great, natural links, some even from leading online newspapers. Anchors are clean and natural. Np signs of spam on archive.org. The only thing that isn't just the right are TF and CF. For most domains the TF is lower than CF and both of them are quite low. For example metrics of the latest domain I registered are: TF:10 ,CF:17, PA:24 and DA :12. So does TF and CT and the number TF/CF matters that much.