The second worst possible 415 vendor option is worse than your best possible 400 option by 250 dps? I’m not shocked. 3 of the 6 possible vendor chest options are an upgrade for you, they range between 250 to 400 dps better with the addition of the bonus stam. Again, you aren’t farming heroic jadefire except for the ability to get more dust to gamble on chest again.
Are you trying to prove my point?