Spell casting Fury and the other Fury linesFollow

Ok, I a question reguarding spell casting fury and all of the other fury line AA abilities...

When i had SPCF 1 my highest crit was 3280 when i had the 4 points for SPCF 2 my highes crit jumped 4240 with agnaars... Granted i don't see much of the 4k crits maybe once in a blue moon.. I know that the discription on spell casting fury states that have a chance to do up to double normal damage. On an average with SPCF 1 i was critting in the 2.5 to 3.2 k now with SPCF 2 its around 2.7 to 4k. I have an ID4 item

Is there a cumlative score on each Fury aa ability you get. If thats the case then if you had all 9 fury lines of AA's i can see that having 8k crits with either Strike of Solusek and prolly the 7k range on agnaars. Does anyone have info with this...

Well i can agree to that to some extent except wizards get the lvl 55 Spell casting fury

lvl 59 class its spell casting fury mastery

then the Pop version of spell casting fury

Thats 9 class points which is 30 aa points total

Hince why i am bewildered in this a fellow wizard in the guild has way more aa points than i do however, he lacks 2 aa points to finish the 9 aa ability points in the crits

I seen him crit with Strike of Solusek 6 times in a row averageing 4k and topped 6036

we get a grand total of 21 percent i beleive but i am not sure if this is correct...