SC2Mapster

You should launch your missile by persistent effect rather than just target.
Something like this:
Ability -> Persistent "TARGET" -> launch missile "LAUNCH"
code for persistent will be:

    <CEffectCreatePersistent id="TARGET">
        <WhichLocation Value="SourcePoint"/>
        <OffsetVectorStartLocation Value="SourcePoint"/>
        <ExpireEffect value="LAUNCH"/>
        <ExpireOffset value="0,-1,0"/>
    </CEffectCreatePersistent>

also throw driver and etc

EDIT:

HOLY SH\\ if i use source unit as launch point (which is necessary to use action actor) then all my plan explodes >.< ok now i cant get how to make simple rocket too :X