There is a serious problem if your bards only have 500 crit when they have a perpetual 10% buff and a minute cooldown 20% buff. Joking (not really) aside, since these are direct modifiers, you can test crit ranges easily using bard. If your base stat is 350, then you can modify it to 385 or 420 or 462 controlling all other variables. The you can add a piece of gear that adds 1 to the stat and again apply the modifiers, up until you have about 660 (with the gear you stated you had access to). Because is possible to be far better than the gear your FC members has (Bards should be able to go over 550 crit, then apply the modifiers) you can test with more sampling values. When you record results, do not calculate a direct average. First, filter the results (removing the worst and the best trials), then take an average of trials. It should go without saying that one test at 1000 hits (or one test at 10,000 hits for that matter) is meaningless data. You need to do multiple trials each controlled at the same values of at least 5000 hits, then filtered, then averaged, then interpolated to have near accurate results. Doing it any other way will show that you will fall prey to the fallacy of using an instance of (pseudo) random numbers. Obviously, this will take a long time to do correctly and if you plan to split the work, you need to make sure that all results are exactly controlled (stuff like race, gear condition, and weapon choice matters too).