I took low doses of hormones in my early 20's for several years (4)
Those that have done that tend to do well later. Not sure why.
Possibly because fat cells get created and they're not destroyed later when you stop.
So, if you take hormones later, they're simply reactivated.
As to proper fat redistribution, unless you're overweight, your male skeletal structure and frame will overshadow the fat you have. If your frame is much bigger than a GG, then you need more fat % to really show on your frame, same thing as breasts, a breast size that works for a GG won't work if you've got a 44 inch frame. I think that's where the "too small breasts", not enough fat redistribution, come from mainly.
TS's that have GG size breasts tended to be small framed for their height as men. In my case, I'm 6 foot tall and wear 36C, got them in less than a year (I'll be pushing D eventually the way I'm going) (I'm 39). I've got substantially bigger breasts than my sister. She's a 34B and 5 foot 8.
Of course, if genetically you were supposed to get A's on a 36 frame and your frame is 46, the body will probably not compensate, its not like the breast gland knows what body size its on when it receives the stimulation from E and progesterone, and you'll be lucky to get 42AA. So, your not getting less breast tissue, your just getting less proportionally unless you body size is GG like.