AI’s are also sometimes used during PCT because of their ability to stimulate LH and FSH. However, they also lower estrogen levels and often too much during this phase. Part of the PCT plan is to allow the body to normalize and part of that is maintaining normal estrogen levels. Estrogen is not an evil hormone many men, especially steroid users often believe it is. Estrogen is extremely important for muscle building, sexual health, mental health and a host of other areas. Estrogen levels that are too high or too low, both can be very problematic.
Tibolone has tissue -selective estrogenic effects, with desirable effects in bone , the brain , and the vagina , and lack of undesirable action in the endometrium and breasts .  Its tissue selectivity is the result of metabolism , enzyme modulation (., of estrogen sulfatase and estrogen sulfotransferase ), and receptor modulation that vary in different target tissues, and differs mechanistically from that of selective estrogen receptor modulators (SERMs) such as tamoxifen , which produce their tissue selectivity via means of modulation of the ER.   As such, to distinguish it from SERMs, tibolone has been described as a "selective tissue estrogenic activity regulator" (STEAR),  and also as a "selective estrogen enzyme modulator" (SEEM). 
sustanon should be injected at least twice a week provide stable blood levels, the propionate in sustanon will be out of your system by the time you inject again. 100mg of Deca every 10 days is about just enough for the joint healing properties but I wouldn’t expect anything dramatic from it. The chances of gyno are a lot more from your sustanon than 100mg a week of deca. All you need is a minimal amount of arimadex or you could use Red-PCT during cycle. 1/2mg twice/wk adex or 1 capsule a day of Red-PCT will work. I’ve found the arimistane in Red-PCT to be just as effective as arimadex, my bloodwork shows that it keeps my estro in check so I know it’s good