If the fov is the same in both screen captures, and you are using TR. Hit F9, then home, and see if they remain the same as the pictures. If they do, ask FLS if he pulled the head back for the beta default view when he did the work on all of the head positions. If that is not the problem then. If you are using the same bitmap in AH2 and the beta, looks like deRevic12n.bmp. Did you copy the deRevi12n.mil file with the deRevic12n.bmp to the AH2 sights directory?
My PC that I did the gunsight work on is out of commission until the new parts arrive to build a new PC. So I'm trying to remember the name I gave the Revi C12\C night reticle you selected for your F4u.
Just remember that all of the sights in the sights folder have a gunsight.bmp and gunsight.mil size control file. You need both files in AH2 or the beta. Otherwise the reticle will show about 1\2 normal size.