Hiya! i had unders from a 32a. and my gap in the middle was quite big and obv they cant make them closer just incaseof a monoboob!
Even at 4 months post op my boobs were still a bit hard and i couldnt really get a cleavage, as they wudnt move much in a bra.
At about 6 months post op once they were softer and can get a cleavage in a bra.
You are still quite early days and they change so much so i would just give them time an im sure they will be able to.
Add me if u like, i have a couple of pics which u can prob see the difference from then till now. =) xx