Man, just read the support article about how to rotate a new sub into a stack. It not only changes my planning for subs in the future (changing a stack is not easy done by 5 days washout) it also explains why I had problems getting consistent results and even feeling like I performed worse than without subs. I was for example switching titles out within the same cycle.
What does it mean for the future? Take a 12 day break and make a good plan for a long term stack that covers the next 3 months with 3 different (major or custom) titles.