Emmett,
Congratulations on all the exciting changes. Your look is spot on.
The unbridled truth...you had a passing voice at 5 months, and 7.5 months was even better! 10 months...forget about it!
I have a much deeper voice than I think. If I listen to it recorded I hear what others hear. In my head, when I talk, it sounds higher. Maybe that sensation is adding to your uncertainty.
You have hit a legitimate level! I don't know how T works for FTM, but I would guess you could keep expecting changes for at least the 12 month period. That is about how long it takes for a cis male during puberty to get his full voice.
Hugs,
Lacy