Hey Cepheus! Thanks for sharing your story. It looks to me like you're doing everything right. I will say (in my humble opinion), you're not going to visit a therapist and they will provide you with a transgender label. If they are any good, they will ask you some questions and help you come to a healthy dose of self-realization. If you feel you are a woman, you are definitely a woman -- you don't need anyone to tell you how you identify because only you understand yourself enough to make that choice.
As for looks, every concern you've fielded can be addressed. First and foremost, there are plenty of tall women out there. I'm tall myself (6'1) and I pass just fine. I see many women at work and in public that see me eye-to-eye (or may be taller!). Cleft lip can be addressed too; actually, if you decide to start wearing makeup, it would be really easy to change the shape of your lip using a little foundation, powder, and lipstick, or you can opt for surgery. I understand a lot of insurance companies may cover a procedure like that.
Voice training is something you have to work on, but again -- lots of women out there have deeper voices, too!
It sounds to me like your Father won't be much of a problem if he's out of your life, or at least at a distance. His problem isn't your problem, it's his. He can wake up from his old-hat philosophies and embrace you, or he may not. There's a lot of complexity here that a proper therapist would be able to give you better guidance on, but don't let his behavior factor into any important decisions you need to make for you.
All that said, do whatever it takes to be happy. I know it can feel lonely when you're first figuring things out. When I started HRT my life improved dramatically, and I would make the same choice again in a heartbeat. Remember things take time and it will take some heavy financial commitment. I've found the more open and truthful you are about yourself, the more people will stand with you and offer you their support. It's a rocky road, but one I would happily walk again. Don't live in that limbo. You sound to me like you're ready.
Apple: I'd strongly encourage you to stick with the aftercare. Letting things close up would be very hard to fix. Everything I've read has the "things get better" threshold at 6 months at least. Have you thought about trying a different regimen (shorter sessions but at more convenient intervals)? Also if the dilators you were given don't seem to be doing the job well, maybe look into a different model or two?