Hwacha is perfectly fine as is. The fact that heavy clip can turn it into a long range weapon is bonus enough, as without it, any other ammo type just spray's rockets everywhere, making it most effective at medium range at best.
As for increasing the aoe, then you just make burst Hwacha even worse for people, which I doubt anyone feels is needed.
You know the Hwacha was fine before as well, it's not realy in a better position, I'd say that the perfect accuracy Heavy clip has now is extremely detrimental for this weapon, basically the new Heavy clip hurts it more than it helps.
Old Heavy clip still allowed it to be used at a pretty long range (roughly 900+ meters) with much better effect due to the 20% deviation the projectiles had.
Also Burst disables everything on any ship already anyway, so more AoE wouldn't make it any more powerful than it already is, but I don't realy want more default AoE, rather than some spread returned to Heavy clip.
(and by all means, this isn't a major issue, I just feel it should be adressed)