Your height, weight and reach is pretty much identical to mine. And by anatomical standards is pretty average.
And I agree, there are so many variables - that question is impossible to answer. There's no such thing as an optimal body type. Just like it's impossible to tell which car is fastest simply by how long it is.
And why you asking us if you're gonna grow more? Who I look like, Jesus? look at yo daddy foo!
lol...
jk