Thats up to you. Ill give you the gist of the idea, and you decide the specifics.
The idea is what others have referred to as "priming". Think of a competitor who depletes themselves, their glycogen, for a period prior to comp day. They finish their comp, smash the carbs again...and subsequently grow like fuk.
Now we dont have to go to the same extremes, because the general principle remains. Drop carb intake for 4+ weeks. You can carb cycle, with refeeds every 4 or so days. But what you want to be doing is setting yourself up for a maximal anabolic environment. This will occur when you reintroduce high carb amounts that coincide with your blast.
Youll grow like a fuker.
The extra beauty of your scenario is that the trt should minimise muscle catabolism. Obviously, keep PRO up and adequate.
The basic idea is to starve your muscles, in a sense, then when they are most receptive and saturatable increase CHO and AAS intake. You dont have to go nuts either, as long as you transition from a "low" to a "higher" amount.