All same gear, Dynamis mobs:
Bison: 272.666
RCB: 293.694
Salisbury: 275.757
Salisbury +1: 282.279
Seeing if I can change out any gear to push Salisbury +1 up to RCB
Haste gear in sample set:
Charis+2 head
Brego hands
Twilight Belt
Etoile+2 legs
Charis+2 feet
Can remove up to 5% haste since it's made up for in food.
Removing Twilight Belt puts us 2% below haste cap, as well as losing 2% DA. There aren't any other waist options that can make up for both of those lacks.
Removing Etoile+2 legs loses the Saber Dance bonus. Nothing else can make up for that.
Removing Charis+2 head puts us 1% below cap, as well as losing 7 Store TP. Nothing else adequately compensates for that.
Thaumas is an improvement over Charis+2 feet. 3% DA and extra attack pushes DPS up to 285.051. Still not a match for RCB.
Heafoc is an improvement over Brego Gloves. DPS up to 288.487. Still not a match for RCB.
Can't do both Heafoc and Thaumas at the same time, though. Lose too much haste.
RCB is 1.8% ahead of Salisbury+1/Heafoc. If we assume that damage has a linear correspondance with coins, and between 100 and 200 coins per run, that translates to between 1.8 and 3.6 coins gained by using RCBs. If average coin value is 7200, that's between 13k and 26k worth of additional coins.
Cost of 4 RCBs is ~40k. Cost of 1 Salisbury+1 steak is (at the moment)... ~100k.
Net loss of 63k-76k.
Even without the -10 Store TP, it would be only slightly better than RCBs (~297.755), so would not be worth the cost.
For it to be worth using (as in, a wash compared to RCBs), cost would need to drop to about 20k per HQ steak. Unfortunately most servers have the primary ingredient (Cerberus Meat) up to around 50k each. Am guessing it's being used for the next tier of cooking skillups. If the price ever falls back to the old dirt-cheap level, or gets saturated by crafters skilling up, could be viable.