It is not the cameras or shooting angle that's at fault.
It is not the computer animation that's at fault.
It is the "fault" of the OmniMax deeply concave screen coupled with stark vertical lines of principle subjects
of the images... in conjunction with the very close proximity of the audience seating.
When they fly the seats INTO the screen, those guests seated toward the outer edges of the screen
WILL be forced to see the curvature of the screen on objects in the center.
Under many conditions (non-vertical subjects,) that curvature is not as noticeable
(but it is always present.)
The original film was made up, by and large, of scenes that did not feature
images that were very prone to revealing the curvature of the screen.
Unfortunately, this is not something that can be "fixed."
But, a return to the original film (as they are doing in California) will
ease the situation.