Well heres a little more info:
http://magelythings.com/foci_and_crits.html
Quote:
A normal crit (with any level of Spell Casting Fury trained) adds 100% of the base damage to the final damage
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While that is a mage site, it still supports a non-progression through SCF. So at the least, SCF should give an immediate boost to 100%.
I'm going to keep looking to see if I can find anything for a non-aa'd toon