The angle that the pedals are mounted in relation to driving position has a huge effect on effort required to reach max braking levels. In an earlier post I mentioned I had to run my BRF at 100 to be able to lock up tires on most cars, since I modified my rig and rolled the pedal assembly so that the top of the brake pedal moved closer to my body and pivot stayed in the same place I can easily reach max braking with BRF set at 30-50.
It was not a big deal to change this, I just machined some spacers to fit between my rig and the Fanatec pedal mount.
I have the standard Fanatec V3 load cell set, not the inverted set, mine are bottom pivot. I could see this being a problem with any LC pedal set, the manufacturer cannot build the pedal set to work well at variable mounting/seating angles.