Making a Dual Blade, Help?

It works with Final cut like that, but when using CoH, and doing 90k crits my MI attacks will be at most 30k. While using Bloody Storm, my MI attacks cannot seem to get above 30ks. My range isn't 30k, but it is definitely not 70% of previous attacks.

http://img218.imageshack.us/img218/4651/maple0026t.jpg
(Upper Stab)

11602 / 22046 = 52.63%
18922 / 37662 = 52.63%

http://img522.imageshack.us/img522/6775/maple0021v.jpg

193415 / 367490 = 52.63%

The result could have been affected by a lot of variables (to make it not exactly 50%) such as PDRate, FC's passive effect and weapon potentials. For all I know MI's damage is skill dependant and isn't affected by Final Cut and sometimes, criticals. Hopefully someone more knowledgeable than me can answer this.