you gain like 432 AR with those grand charms over normal charms but lose out on AR by no raven, also -33% doesnt completely cover that imo like u said:
Lets assume you have 20K AR and opponent has 40k def ( if your not happy with these numbers, feel free to reproduce calculations with your own )
lets assume both players are of equal level

chance to hit without -def = 33%
---> chance to hit with -def = 37.5%
If you work things out a bit, you see that if your AR was over 24k, with the opponents def staying at 40000, then you would have the same chance to hit - you would easily get that difference in AR with angelics. Also when comparing it to an EDC setup, both weapons have the -33% def mod so it would cancel out that bonus.
Another thing is, that your def
might be a bit low without either an eth alma/prudence ( but I'm not sure that atm )..
edit: Also iirc you need 60 ias to reach max bp with your weapon, I can only see 40 on first glance, but maybe I'm missing something atm
This post was edited by Jeebus666 on Nov 30 2011 03:11am