Actually, the reason the jump/grav values are the way they are now is due to a lack of understanding of them when we first got the code, and a lack of urgency to change them now. We originally thought that dgrav should be the value that is primarily modded, due to an archaic belief that ugrav screws up jumps. Yes, it does screw up jumps... if you don't change the jumps to compensate properly.
I think kupo has the wrong idea, actually. While perhaps the game could use higher gravity for comboing purposes (as in... dgrav) while lowering the hitstun, the main thing that is slowing this game down is the lack of ugrav, which influences how fast you jump. Now, what kupo is right about is that we need to fix hitstun. Whether that be by using universal dgrav or by getting a character specific hitstun code, it needs to be done. I would like to see the speed handled by ugrav and the hitstun problem by character specific hitstun, and then take it from there.