Potatus's Warrior Questions

[Videri]

Hail! I have questions about weapons, aggro, and gear. Feel free to answer all or only some of them.

1. Kicsh Der Pavz or Obsidian Shard in mainhand for maximum aggro generation?
Mainhand swings proc twice as much as offhand swings, and the Kicsh has a better aggro proc. Also, the Kicsh has a better ratio (10/38 versus 6/25), but a long delay of 38...I'm not sure what to think. I have been mainhanding the Kicsh and offhanding the shard.

2. Should I put my higher-aggro proc weapon in mainhand or offhand?
One fellow warrior told me that because the offhand swings less often (true), and procs are calculated on a procs-per-minute basis (true), that weapons will proc relatively more often in the offhand (false) so I should offhand my Kicsh. He's wrong, right? Surely proc chance is calculated based on weapon delay, without taking into account the fact that Dual Wield might not go off. And offhand procs half as often as mainhand anyway. Right??

3. Crafted Breastplate versus Enameled Black Chestplate (25ac) versus Rubicite Breastplate (19ac 3hp regen)?
My current plan is to keep wearing the Rubi til I hit 50, then swap to Crafted. However, it's difficult to weigh the Rubi's 3 hp regen, EBC's 3 more ac, and Crafted's 5sta and 25hp.

4. Should I buy a Diamondine Earring or try to farm one?
~1200p or who-knows-how-many-hours in there, with no guarantee of Lasna dropping the earring, or even spawning at all. I had a group in the pool room for a couple hours today and we didn't see her. I'm leaning toward buying one (pm me).

5. Does Princess Cherista also drop the Diamondine Earring, or only Lasna?
The earring's wiki page only lists Lasna, but Princess Cherista's wiki page says she drops it.