I'd suggest two things. First, pick out landmarks when on final that put you on the centerline and use them each landing. Second, fly it closer than you think it is.

Actually, I'm only half kidding on that last remark. I've flown (behind) into trees twice early on because I thought I was closer than I was. It made me realize I was further out than I thought, and made me consciously think about how far out it might actually be.
Dennis-