[ Screenshot post ]
Apparently there's a 5-attachment limit, heh. Just some screenshots to show the missiles in action in case anyone was wondering. Yay fireworks in the 5th one, lol.
The balance feels okay to me but feel free to comment. They're close range, they're not cheap, and the total damage is comparable to the other missiles. One happy (and intended) side effect is that if you have an expert missile specialist his skills should apply to all of the warheads. So these things are okay in the hands of an unskilled user and deadly in the hands of a missile specialist.
Edit:
Yeah I know the funky colours may be too fruity for your tastes
(b-b-but it's danmaku!) but before anyone start yelling "omg FFFFFFFFFF" at me, please note that you can always edit the FlashLiveTime back to normal values and change the RGB hue to something more to your liking

A quick fix would be to open up
Rockets.xml and then pointing all four missiles' explosion tags back to the generic rocket_explosion instead of the custom danmaku ones.