1) Yes. Sumo may work better for your limb/torso lengths, that isn't abnormal.
2) Probably not. I'd suggest you look into a good chiro or PT that does "joint manipulation" and get that ankle worked on. The pinching you're feeling is likely due to an incorrect joint alignment that may require outside "help" to fix. You might also try the JumpStretch band flexibility routine for the ankles
, as well as the foot drills