There is a bug with these weapons that make them complety unusable.
Poison injection (and morphs?) consune the "cruel flurry" buff EACH TICK
Ex:
1- cast poison injection
2- swap maelstrom 2h bar
3- cast rapid strike
No more to do.
See the poison injection going: the next one tick will consume Maelstrom buff, get buffed by it (but only this one tick)
then next tick back to normal value.
The ability you cast after cant be empowered.
So if you have a poison injection runing, you can't predict if you will be able to empower your next DOT. You need to have no poison injection tick between the cast of rapid strike and the cast of your DOT. Wich is almost impossible, because of the ability timer (0.6 sec +1s for next ability)
TY for reading, and sorry for poor english.