^This was also my experience. When I went to some parties, when talking with the mtf TS's there, it was just like talking to any other guy. As I have been working in a profession where over 90% of the workers are women, it was easy to tell the difference. Other than trying to change their voice, the content and style of speaking was still distinctly male. Same with the behavior; although there appeared to be a conscious attempt to move as they believed females did (which is almost always decided by anatomy), the would 'slip' into male pattern body mechanics every so often, giving themselves away for who they were pre-op. Far too many had become caricatures of women, rather than finding the normal style they were trying to emulate.
My own conclusion is, while it may not 'be their personality', over a lifetime of training ourselves to 'fit in' to the male world, it DOES become second nature to behave that way; perhaps as almost an automatic defense to stave off anyone else's possibly seeing through the 'act' and finding out we are CD or TS. So even after transitioning, what we've forced ourselves to do for decades still lingers, no matter how much we wish it didn't. Kind of similar to, say, a baker coming home and smelling of fresh bread, even after he takes a shower. Some things just become ingrained into us (pun intended).