Harder to hit open docks?

I usually cut it too close one way or another. I'm either one dock or half a dock off everytime. I just end up backing it straight as possible and doing a few forward S to get it over.

 

I have the same problem. I am as green as they come, and am OK with equipment on either side, and although im not the fastest at putting it in the hole, I can get it in without tearing anything up. I had to back up to an open dock (7 doors, all empty) the other day, my god... It WASNT pretty... Half of my problem is I am not a fan of the lines on the ground, so I rarely use them to help guide me... its a habit I need to break