Thought this might be of some use, its a better/more accurate description of advanced settings thanks to Aaron.
Vibration scale: controls the scale of haptic vibrationFFB scale: controls the scale of combined trail feedback and dynamic forcesSteering sensitivity: Adjusts the DOR with a soft lockSteering linearity: Adjusts the linearity curve of the steering input, higher makes it more sensitive around center/less sensitive at full lock, lower values make it less sensitive around center/more sensitive at full lock. 50= linearFFB understeer: this scales the aligning torque from machanical trail, lower values increase its affect, higher values reduce its effects giving a higher feel for understeer (ffb drop off)FFB minimum force: scales the aligning torque from pneumatic trail (on my setup lower values increase the aligning force from pneumatic trail and higher values decrease it) default value gives unscaled pneumatic trail ffb dataDamper scale: adjust the weight of the wheelCenter spring scale: the spring is the force pulling the steering wheel toward center; that is to say gravity through caster, KPI and scrub radius. This force is overcome at speed through pneumatic and mechanical trail, the causes of align torque. It’s an active force in Forza Motorsport 7 and at racing speed it’s very minimal.
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This list but I can’t find your original post with the 2 informative statements be,ow it on FFB under and FFB min. You described the tire flex and the behind center they were big for me understanding the mechanics of the FFB. Until the. I never knew that stuff.