My advice is to put all the platforms in the way you want and then see if they behave the way you want them to on their own without having to script anything.
You should be aware that the AI performance in stock DW is a little lacking for two reasons: some of the doctrines are not as well done as they could be; and the main reason, the non-playable units do not have sensors attached to them that function effectively, so most AI platforms are essential sonar deaf.
The LWAMI Mod addresses a few of these concerns. Try running the same mission with the mod and without any scripts or triggers, and if the platforms detect each other, they should engage.
Note, there is one thing you can do that might help things. You can put a trigger in the instructs an AI platform to autoclassify the contact immediately, rather than wait for the usual classification as the target confidence gets higher. So, you can set a script to run that once the target it detected by a platform, the detecting platform automatically has it's ID, this should increase the speed and aggressiveness of the engagement. Also, I have found that unless you are trying to get AI platforms to exclusively attack a single target, it is best to leave their mode as "none" and not specify a target, as this will allow the AI platform more latitude in deciding which targets to attack.
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