Thinkaman and I are really working hard on figuring out stuff about the physical properties. Here are some things we found.
0x020, 0x024, and 0x028 seem to be the same for every character including Red Alloy and Giga Bowser (41F00000, 40400000, 1 respectively). Changing 0x028 to 0 on Diddy Kong had no effect on gameplay.
0x02C is nearly uniform across the cast with Falco having a slightly smaller value than average and Luigi having a much smaller value than average. I suspect this is related to the commitment of a dash (the time before you can shield) with bigger values having less commitment, but this isn't something I'm really sure on. It's definitely not "traction" in the general sense.
0x030 is the frames that an initial jump lasts. I'm quite sure on this.
0x060 is the jump count for a character, including the jump off the ground.
0x0AD affects plunging down aerials; larger values make them fall more slowly. By default ZSS has a value of .5 and everyone else has a pretty small value (Marth is the smallest at .0037, and the second biggest is Jigglypuff at .0375). I can't observe any other effect from varying this value; I'm unsure what it does on characters without plunging down aerials.