I see nothing wrong with Cuss Bursting a water. O.o was able to get my water done in a week. She would get 140+ non double exp and 240+ on double exp.

But yea also depends on the team you use.

to set up a water in cuss do you use;
4turn; Shield Pet, Freeze, Sleep, Shrink?
3turn; Shield Pet, Freeze, Shrink?

Also have to note that all 3 fires in team MUST be 180+ or RB'd 1 being wit using cuss skill would help A LOT.
4turn; cuss, soul dodge, hotfire, attack
3turn; cuss, hf, attack

Other Fires
4turn; defend. def. hf, attack
3turn; def. hf, attack

I once had someone "cuss burst" me and she had all killers. (I didn't complain I was just grateful for any exp. lol)