From what I remember being said about Activate XT is that the only reason why it would need to be cycled is because of the higher DHT levels you would get as a result of increased test. However, if your taking saw palmetto you should find that to be protection enough, is for me anyways.
Your stack looks fine imo (Drive, Activate XT, powerfull) and when you finish with that maybe run a month of 6-oxo extreme solo, and then go right back to your Drive, Act, Pfull for another 8 weeks....as long as you cycle you AI's spending more time off then on, you can do this forever......
Just remember to take your fish oil, and saw palmetto both are anti inflammatories that work very effectively at protecting you prostate as well as all the numerous other benefits
Good luck!!