which mod(s) if any are you using? TMO with lurker_hlb3's RSRDC on top usually did pretty good with it, but if you edited his files at all in the ME, it will ruin the "timing" of everything. I do not recall though if he has the actual attack on Midway Atoll itself in the battle, but he does have both the Midway carriers, as well as the Dutch Harbor carriers represented, though with substituted CV vessels. Since he has the groups spawn over by their "historical" starting positions, you don't have to worry so much about being within their spawning range if you're by Midway itself. Even the stock game has a representation of the battle, though it looks like someone was in a rush to get the game out the door, and groups show up anywhere from January 3rd through June 6th, 1942...
