A lot of my buddies (bio males) said that their voice didn't really settle until 2-3 years after it cracked. So I think it's still going to be a while before your voice settles.
I have been on T for about 8 months now, coming close to 9 months. I have noticed even now my voice keeps on getting deeper...however it's settling out a bit. Not completely, but at least I can sing now without having my voice crack like crazy.