I have set FFB gain to 60% in the settings but every car I drive has the gain set to 100%, I have to adjust very car, is that normal?
That will be 100% of the base 60% that you have set. So if you lower to 90% on an individual car that will be 50%. Well that's how I read it.
Per vehicle FFB is the multi in percentage of the global FFB strength setting - Your "true" Global FFB strength is achieved by 100% vehicle FFB strength (and whatever you've set to FFB global strength in controls settings) and you can deviate from that per vehicle so-to-speak by lowering their own FFB multi. (You are also able to go over 100% for it, for example if a car actually feels too light for your taste/hardware)
Maybe it’s also worth mentioning you can bind a key or button to adjust the car FFB on the fly that’s really convenient if Reiza could give the option for lfb fix and damping that would be perfect