This is old (and there may be something off w/ the fStr capping and of course the pDif uses the old values) but I'll just work with something I already wrote as a base,
2.48-hit Sa+Mercy, Cerb+1 =
Main Hit
({(39bD + 12fStr + f[0.83 * f(0.6*130)]WSC)*3.0fTP + 103dex} *1hit *1.924pDif
Main Multi
+{(39bD + 12fStr + f[0.83 * f(0.6*130)]WSC)*1.0fTP} *0.24hit *0.924pDif *0.75Acc%
Offhand
+{(33bD + 10fStr + f[0.83 * f(0.6*130)]WSC)*1.0fTP} *1hit *0.924pDif
Offhand Multi
+{(33bD + 10fStr + f[0.83 * f(0.6*130)]WSC)*1.0fTP} *0.24hit *0.924pDif *0.75Acc%
= 861.9 + 19.1 + 98.9 + 17.8 = 997.7
This would be like, with "cerb+1". Attack base was 434 it seems. So let's remove 15 attack and add 4 dex and add a combined 7acc.
2.48-hit Sa+Mercy, Cuchy =
Main Hit
({(39bD + 12fStr + f[0.83 * f(0.6*130)]WSC)*3.0fTP + 107dex} *1hit *1.868pDif
Main Multi
+{(39bD + 12fStr + f[0.83 * f(0.6*130)]WSC)*1.0fTP} *0.24hit *0.868pDif *0.785Acc%
Offhand
+{(33bD + 10fStr + f[0.83 * f(0.6*130)]WSC)*1.0fTP} *1hit *0.868pDif
Offhand Multi
+{(33bD + 10fStr + f[0.83 * f(0.6*130)]WSC)*1.0fTP} *0.24hit *0.868pDif *0.785Acc%
= 844.3 + 18.8 + 92.9 + 17.5 = 973.5
So yeah, as expected. Dex is outside the fTP on the first hit. So even though it's critted, it's kinda hard to beat 15 more attack adding to your multiplier on a base damage that's already that high. Not to mention the other hits. Meanwhile, as you can see, the gains of accuracy on the potential multi-proc hits are extremely negligible. In fact, if you look at it, 15 attack is doing /more/ for these hits than 7 accuracy. Of course, the 75%ish accuracy is an estimate, albeit a good one w/ the settings used.
Carlcarl, totally not the case, regarding the accuracy of multi-procs. Soon enough everyone will know, but it seems like for now a lot of people aren't up to speed w/ the new info ;x