It is still kinder buggy, sometimes works....sometimes just sits there and does nothing and I'm not talking about when a enemy is destroyed before it hits either, sometimes it just randomly stops and other times it resets the cool down when you activate heavy yield so you have to wait twice as long to fire it.
I'd say about 1 in 4 times I fire a heavy plasma torpedo, nothing happens. The system simply starts reloading. Another 1 in 4 times the torpedo gets about half way to the target and stops. It's not shot down, it just stops. These two combined mean that only about half of the heavy torpedoes fire correctly.
Now, if this was intended, that could still be cool, but you'd need to boost the damage way up to balance.