I do....I have an infatuation with hydromancy from some previous MMOs I really enjoyed, so I have got all elemental affinities to 40, then keep the umbral affinities of ice and earth at 105 with water at 120.
(50,50,50,104,104,115 at this moment)
Anyway,so I do use drown to debuff water affinity and I often use water II...... anyway, I have a play style that focuses on debuffing, more specifically on umbral, and even more specifically water.
Now if this helps here is a link to a good blog on dots, that also has a good way to test it.
http://lodestone.finalfantasyxiv.com...entry?e=184327