What's missing from this model is a variable rate of turn. You want to turn so that your front bump stays at roughly a fixed distance from the bollard line. As you go, you slowly turn the wheel sharper and sharper until reach your maximum turn radius or you are lined up with your space. You can slightly vary that fixed distance as you go to adjust for minor differences in your initial position. You can also aim for a bit to the right/far side of the space (, and then re-center on the space once you are lined up.