Help with MOMO wheel

Okay, I have a big problem (maybe it's mine) with my MOMO wheel and rFactor.
I have been racing a lot of fixed setup races online, like in the Dutch
Racing League, and it seems that I have incredible amounts of understeer in
comparison to other drivers. If I slow down, A LOT, I can make the turn, If
I try and keep up with other drivers through a turn I just understeer like
crazy. If other drivers are taking the turn at higher speeds AND the setups
are fixed, what could be the reason?

Does anybody have a controller configuration, for sensitivity and all those
other settings, that they'd be willing to share?

Thanks in advance,

pj