AI plane question

[scalelokt]

I hadnt played SH4 in a long time while I waited for good mods to come out. Well now that there are some good ones I have reinstalled it and am having a great time. I attacked a convoy and was overjoyed that the destroyers were much smarter than before and really gave me hell. One question though, the airplane AI seems very strange. When attacked by bombers everything seems ok, they drop a bomb and their aim is pretty good. However I encounter Zeros (I think they are called) a lot. Lately I have not attacked them and stayed surfaced just to see what they would do. So far, they havent fired a single bullet or dropped any bombs. They dive at the sub and pull up at the last second, it really looks like they are bombing me. But they dont drop anything. After that they leave, they dont make a second pass. Definitly something wrong here, is there a mod to fix this that I am missing? Thanks everyone!