None of the proposed WS sets that I've seen have had a significant amount of DA.
My suggested with Kantanotachi would have 19% DA
With this set, the TP bonus is 125. Giving a typical Shoha, before accounting for DA/TA/QA and overflow TP, an ftp of 3.275.
Scenario a will use Gorget+Belt, Scenario b will use Gorget+Windbuffet.
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Some variables:
DA = double attack rate
TA = triple attack rate
QA = quadruple attack rate
f{a} = approximate increase in ftp from DA/TA/QA for scenario a
f{b} = approximate increase in ftp from DA/TA/QA for scenario b
DAfTP = 1 = increase in ftp if a DA were to occur.
TAfTP = 2 = increase in ftp if a TA were to occur.
QAfTP = 3 = increase in ftp if a QA were to occur.
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Accounting for the ftp bonus from equipment:
a = 3.275 + .2 = 3.475
b = 3.275 + .1 = 3.375
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DA:
f{a} = (DA/100)*DAfTP = (19/100)*1 = .19
a = a+(2f{a}) = 3.855
f{b} = (DA*(100-TA)*(100-QA))/100*DAfTP = ((19*.98*.99)/100) * 1 = .184338
b = b+(2f{b}) = 3.743676
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TA:
a = 3.855
f{b} = ((TA*(100-QA))/100)*TAfTP = ((2*.99)/100)*2 = .0396
b = b+(2f{b}) = 3.822876
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QA:
a = 3.855
f{b} = (QA/100)*QAfTP = (1/100)*3 = .03
b = b+(2f{b}) = 3.882876
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Result
a = 3.855 ftp
b = 3.882 ftp
By my estimate, it would require 62% DA before the Windbuffet Belt will diminish the benefit of DA enough to make the Elemental Belt superior. But I may need to double check that.
Edit: beat
Edit2: forgot to sub war