Inner City is best played using Stability Control set to OFF. Same thing goes for reverse. It is very easy to mess up on this track so you have to be patient with the laps.
Last corner of IC and the first corner on ICr, being the same corner, can be done the same by simply tapping once on your digital input and holding the right amount on your analog stick/wheel.
The jumps on ICr can be done with 6th or 5th, but make sure to shift down to 5th if in 6th.
You might need to hold your digital input to steer for some corners. Just make sure you do not have any input on your left stick/wheel to not DS by accident.
The route you want to take on forward is the shortcut after you leave the tunnel, right side of the forks shared with OS, and the long way on the construction site.
You want to run this line on reverse as well.