I personally think trans individuals can be subject to over-thinking with regards to vocal range.
A good example of this is that when I met up with a bunch of trans folk I didn't know while still pre-T, I got a lot of remarks from folks that they were shocked because my voice was quite low already.
So that made me think. I mean, straight off the bat, that was a female range voice, yet it was being considered too low. However, in the past if I presented as more female, no one ever thought anything of my voice. Yeah, it was low but they still just heard a female voice because it was. It lacked a male resonance.
However, if a trans woman could only talk at the range I was at, they'd be disappointed. One woman had done a lot of voice work and actually talked higher than me at that time, and yet was really upset that she was, "Not in a female range!" At that point I spoke up and was like, "Umm...you talk higher than me!" And that was met with, "Oh but you have a low voice." And my reaction to that is that yeah, it was low range, but it was STILL a female range. Females can and do exist with that range. Like I said, no one ever heard my voice and did a double take thinking "Oh, that's too low for a female!"
And now here you are, worrying about where your voice will end up.
The reality is, there's women with low range voices and there's men with higher range voices. Cis individuals don't get a choice in where their voices end up, so neither do we! (Unless they smoke like chimneys, then they get a choice, I guess). If you have a lower range female voice, you're likely to have a lower male voice. I've talked with other trans guys on T who have a higher voice than me but they still have obviously male voices.
If you have a higher range voice then you're not going to drop a ton of octaves! From what I've watched and heard, I think voices don't drop all that much in range really. For me I think of the drop as being more a drop in where the voice comes from. The range does shift, of course, but the resonance is the key to it all and that's what the voice sounds like coming more from your chest. That's what I personally consider the drop - the shift from a voice sounding like it comes more from the throat shifting down to the chest. For anyone on T, they can try to do their old female range voice again the same way trans women learn, by talking more from the throat. Then you can hear that difference for yourself and that's when the idea of what's happened to the voice kinda hit me.
If you go into it thinking you're going to be Barry White, then you're asking for trouble. But if you go into it thinking of it more like a drop in where the voice comes from, then you're better able to roughly guess where your voice will end up.
This is going to sound crazy, I know, and feel free to laugh your ass off at it because I openly admit that it sounds mental even to me, and I was nervous and umming, but I can actually roughly demonstrate throat VS chest talking to try and emulate the shift you'd be roughly able to get:
http://vocaroo.com/i/s0ymaRfJy7lEComparing the throat talking here to what I sounded like pre-T (through YouTube vids like this:
) it's damn close, although a teeny bit higher perhaps, and if I'm able to keep that up it means I might be able to hide transition from my grandparents as I don't want them knowing for inheritance reasons (and I'm using the same mic I use for a Skype phone call which ends up sounding more cell phone call quality so it passes pretty well for the quality level I need

). What I'm doing with my voice is similar (but nowhere near as good) as what trans women can learn to do in order to feminise their voices.
Also notice that when I do a pre-T voice I've been practicing it with my Scottish accent more (for grandparents). Tried to keep it Candianised for this but failed

.
I also do realise that I am lucky with my range. I'm near 3 and a half months on T and it could well get even lower, I don't know, so you may even be annoyed with me giving an example or saying anything, but I'm just demonstrating how mine shifted. I did have a low voice pre-T so that really went in my favour here, so that's why I say it's worth just baring in mind that where you're at pre-T is going to make a difference when you take T, it'll let you know roughly what's possible. Where you're at now is, unfortunately, just the luck of the draw.
As for lower growth, I'm actually kinda the same as you. I could take it or leave it. It doesn't make much difference for me. I'm looking more to get phalloplasty as opposed to metoidioplasty in my future, so how big it gets doesn't make too much difference to me in that regards (at the moment at least). I also tend to pack regardless.