Alright so I'm building up some tier 1 web 2.0s that were expired and I re-registered so they have some PA and history. All the content on it is unique, no spun content most of it is re-written articles. I want to send 300+ cheap PBN posts and web 2.0 posts to my tier 1 but I want to stay on the safer side since I want these tier 1 web 2.0s to last. So I decided to build tier 2 sites, including some web 2.0 accounts, to act as a buffer between the cheap PBN posts and my tier 1. Question is: how many tier 2 sites per web 2.0 should I build for the best effect? Is it the more referring domains the better? OR should I only build 2-3 to help conserve link juice?