Sort of agree with that damage thing part, I mean how do we actually know the real number and percentage anyway.
and about injury, the most simple theory that I have been use up until now= SDI>DR=scream fast
reason I said this cause I used to do pure SDI tech build VS Tank Res[BCC158 to be precise]
earlier when he just reach me and I play like 921 SDI+1000 Block or something like that and he is like ... can't remember exactly since I saw his status only once around that time, all I know is that my SDI is much more than his DR [since he still play DR+DDI and such]
and as expect, every match against him I hit light+excru-rip move most of the time and it doesn't take long before he start to scream
later on time pass and he change his AT to pure tank build [no DDI, same amount of Hp+Stamina, since at that time I taught him that DR is all that matter which is very long at the moment

] and somehow he doesn't scream at all, that why I conclude that DR=no scream [such a stupid way to proves it though but that just what I experience with my own eyes] [long time ago though, right now our exps gap are far different now]