If it were anadrol or winstrol or a much harsher/more androgenic compound I could see slowly upping the dose to see how your body reacts but Tbol is relatively mild and as Trevor said it doesnt aromatize into estrogen so you can just run it straight.
Tbol will give you some nice strength gains. Just run it the last 6 weeks. The test and deca will add some bulk and the tbol will finish of the cycle nicely. Make sure you do a proper PCT following the cycle.