It also brings the R/S ratio w/in a more tolerable level to enable the motor to rev to 9K from my understanding. Please correct me if Im wrong.

If I remember correctly a great R/S ratio is 1.65?

A gsr crank would give the B20 an R/S of 1.682 as aposed to 1.541, allowing it to rev much higher without getting too much horizontal play. (right?)