I can tell you that Sonic/Energy is great for soloing. Siren Song puts the minions and lts. to sleep, Screech plus the EM attacks keeps the boss stunned while you take them out.
Also about the KB to KD in Shockwave, I actually find it handy when some enemy groups are spread out to use the knockback to clump them together (usually for Siren Song.) But your mileage may vary.