You are correct F4UDOA, the P51 has the largest viewable sight in the game. While aircraft like the 109, and zeke have the smallest. All even using the same default sight. With such adjustable head positions in these aircraft I doubt its the distance from the sight that causes this.
Perhaps Pyro can drag himself away from 1.05 just long enough to comment.
Someone start a new thread...
AKSKurj