A wonderful Warrior Aggro thread on Blizz forums

[Althor]

I'm not sure what you meant by this.  Can you clarify it a bit?
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Here's the link for the top rank of Fade:
http://www.thottbot.com/?sp=10942

Note the part where it says:
"Apply Aura: Mod Total Threat (Fade)
Value: -820"

And for Feint:
http://www.thottbot.com/?sp=11303

"Threat
Value: -600"

These give you hard numbers to work with for these spells. You should be able to scale the Warrior's agro generation values to these.