So I tested out the new Torque Distribution on the two Ioniqs, and I think it's bugged? Both of them accelerate slower if the setting isn't at 50/50, and it's especially noticeable if you put it on 0/100 (RWD) or 100/0 (FWD).
0-100 km/h test:
- 50/50 distribution does around 4.9 seconds;
- 0/100 distribution does around 7.5 seconds;
- 100/0 distribution does nearly 10 seconds (!!!).
Seriously, try a standing start on Special Stage Route X with a 0/100 or 100/0 distribution, and you can clearly see the difference between your Ioniq and the AI's (which is on 50/50). Best leave it on 50/50.