Ok, duals always have signifigantly more patk than any other weapon. Then, when you hit A grade all of a sudden duals take a signifigant hint and are a fair amount lower in patk than one handed weapons. Same applies for S grade.
I gave up on my BG duals & traded them in for a DS dagger. I bought the dagger using crystals & my own EWC. For cheap about 7mill for crystals & another 9mill for EWC) Then I had a friend who loves to OE stuff like crazy help me OE mine! YAY +9 DS with no SA yet! :D
ahhhh oe'ing can be a fools game. Many lose more than they gain in that bastard game. I used to OE a lot but I just OE my duals now and just buy what I need especially w/ the cost of enchants.
My guess would be to offset the armor bonuses. Still, the p.atk of A grade and their SA's is laughable. Kesh*Kesh being the lowest A grade dual has 8% haste, but is it really worth burning through all of that expensive A grade SS??? And the p.atk is so low that you almost have to overenchant -- again, adding more cost to use an A grade dual.
It almost makes you want to save your adena and stick with B grade.
i think a Kes*Kes starts to pay off at +9 or something below that you most not even think about it i admite they are great in PVP witch they are made for but for PVE ->BIG NO<-