Abyssal echoes is more or less useless coupled with warpath.
Why not having devouring orb cast instead ? It would allow the excellent orbital orbs to appear without having to stop your spin to cast it…
If not possible, it would be great to add an instant cast node to Devouring orb in order to cast it without breaking the spin which is very poor. Even at a great cost of mana (like +50/100%) it would still be worthy.
Playing as a warpath void knight right now, and it’s nearly impossible to use both devouring orbs and war path, which is a pity since the orbital orbs seem to be made for war path 
Just my two cents…