The USN AA indicator is very obtrusive and clutters the screen.

How about something like this?

(Image doesn't show, why?)

Having it available for all nation AA would be nice, though, but that's not what this is
entirely about

Any CV that complain about their planes getting shot down too easily are probably
flying them in a straight line at default height.

Try hitting planes swirling above you, there's not enough time to look back and forth
between the angle indicator down below and the rapidly changing angles that are
needed to fire on planes above you.

Learn your angles all you want, half the trouble in these situations is even knowing
what angle you're at and finding the planes are somewhere else after you blink.