First of all, congratulations Keri!
I find very interesing the topic about dating. What Angelique says happens way too often, there are many many guys interested in just sex.
I think what Ashey suggested is nice idea, focusing your profile more on the side of your hobbies and interests and not mainly on your looks. I think if you look very good the vast majority of the guys that message you are gonna be interested just because you're pretty and sexy and those are the main features that they seek because they are looking for sex. You could try to give an extensive description on your hobbies (specially those that can be more appealing to men, like practising some sport if you do like running) and suggest "innovative" dates, like go running or go spend some time doing any activity you both enjoy. Men who are looking sex are usually impatient enough to spend time doing those things.
Another thing I do is not to speed things too much. I mean, I just don't give them what they ask as soon as they request it. I try to pay attention to every single detail.
You need also to keep in mind that young men are very promiscuous, and not being able to give them biological descent may be an issue for some.
About boobs... Yes, I think men love boobs (most men love big boobs I think) and they can help you a lot to get guys attention. Even if HRT works nice, I think Breast Augmentation is a very nice investment. Anyway, you look really great (I'm being honest) even if you don't have boobs at all, I'm not really sure if boobs is the key issue here. It is true that a lot of guys love girls with very curvy girls (slim girly girl with big breast implants and big butt implants it's usually a killer combo) so that coud be the thing.
If you found guys that were boys who had previous relationships with TGirls would be nice to know if those girls offered the boy something more.
I think improving your looks is always a great idea and a nice way to spend your time and money. Not just to get guys attention, but to feel good about yourself.