When I started working on the DB, I had it in mind to change as little as possible while still changing the most noticable things in gameplay.
The TB-23 is a less capable version of the tb-29, less sensitive and washes out sooner, but is still more sensitive than the tb-16.
I have not looked at length because I am trying to tinker with as little as possible before 1.2 comes out. I don't want to go through the DB changing all kinds of things because my goal is to keep it as playable and bug-free as the original DB. This is way to complex to go changing variables that I don't really know, so I have stayed with swapping around functional bits and changing as little of the actual numbers as possible.
Basically, I have gone after the five biggest things that bother me, and changed as little as I need to so that when I play the game, I won't notice them.