Longitudinal ffb setting

[Kurupt CDN]

Iam just curious if any of the ffb gurus could help me out.....I want to a add a little bit more ffb under break to make it feel like there's more bit on initial breaking before lock up happens. Which settings would I adjust in my controller.ini?
I currently use 70% strength ingame with low settings and don't want to increase that and induce any canned effects.

Cheers