I think the two weapons you mentioned won't work very well together, and also your build...
First, crit damage boosting cards wouldn't boost the damage of the EQ proc from the faceworm queen transformation.
Secondly, it has good attack and 2 slots, which is not bad but... that would mean using the rwc knife on the offhand. For some reason the rwc ring/pendant with knife combo does not work when worn on the offhand(tried it before).
This means you're getting the refine bonus and +80 atk and +10% on all races. A 4 slot dagger with racial cards should do more damage. On high defense bosses, maybe ice pick would help more.
If possible you could try using a drake card to ignore the size mod instead of relying on weapon perfection from the rwc knife. I presume you're using megs, so you have quite a good bit of str for damage. Aunoe cards probably would be better for you.
Note: people say it is better to card the drake in the mainhand weapon. It isn't very wise to place it in an rwc knife anyway, which can autocast weapon perfection...
Edited by ShinKokuryuu, 31 August 2014 - 07:07 PM.