Northern Brewer's site says that torrified wheat will "increase head retention and body at as low as 8% of the grist."
In the first IPAs I brewed, I used CaraPils for head retention. In my last recipe I substituted for torrified wheat. I did this because torrified wheat should ferment out better than CaraPils (I think; 80% extract for torrified wheat vs. 73-74% extract for CaraPils). In all cases, I've only added a flat 1/2 lb, which is usually somewhere between 3-4% of the grist. I just saw the 8% recommendation from NB today and it got me a bit curious. Although that's not a ton, it does seem a little on the high side for a minimum. That means for anything over 11.5lbs of base malt & other grains, you'd need more than 1lb of the torrified wheat. That just seems like a bit much; I don't want wheat to be a significant part of the character in my IPA.
So, I'm curious if others here on HBT find that you really need 8% of the grist to get the head retention out of torrified wheat, or if less does the trick for you?
(Side Note: It's stupid that my browser auto-corrects "torrified" to "terrified" every single time.)