Agreed, bar dar below 500ft must go. I think it would be best if you showed up on DOT dar when NOE IF you pass within 6k of an enemy installation (factory, base, field gun, walkie-talkie equipped ninja sheep, etc). Until that happens, NOE bars should dissapear.
Heck, the sole reason of NOE is to sneak in...and when you DO sneak in you still have to fight off ack, vh and the n1k horde that ups the moment a single dot appears near the field. Long range strikes are impossible now.. if we wanted to take A12 from A22 in the minandao terrain, you need a CV or it wont happen. Yet, with NOE, a group of fighters, bombers and goons could fly the whole way in, evading the coast (to not be spotted by coastal guns) and they would still need to get alt before reaching 12...plus the planes would show in dot dar the moment they 6k NOE from field. The enemy DOES have time to react and scramble to defend the field.