Then disposition fields in traits xml are useless, just disable them completely.
We have Mind Fucked, Kind, Dependant and Broken Will with small disposition bonuses. We already have a good effect for Mind Fucked, and Kind seems a bit out pf place here.
Broken Will probably should be less dependent on disposition rather than raise it faster, I'll think about it. As for Dependant, it could use faster rate (and its opposite Mature conversely).