i rotate it every 2 weeks, so every 2nd week on back day, 1st exercise i do regular deadlifts, then 2 weeks later i do 3/4 (rack) deadlifts, then repeat etc, 2 weeks later reg etc. The reason i do it like this is because i do a lot of singles and heavy percentage pulls, like 90% of my max or more sometimes, so i need more time to recover.