LMP2 snap oversteer under braking?

I'm still learning LMU and mostly focusing on LMP2 at this point. Had mostly shelved the game but am giving it a big push again since this latest patch.

I'm finding that braking is extremely difficult: using the default setup I get some serious snap oversteer when hard braking, especially at the end of a straight. Forward brake balance seems to help a little but not enough.

Is this normal for LMP2? Do I need to make setup changes? Or is the problem entirely between the seat and the pedals?