Thanks for the tip about the Silverado.
My main gripe is that it doesn't matter how fast or slow I go to corners and if I'm leaning forwards, backwards or not leaning at all, the bike just keeps on understeering.
And if I take even a passing glance to the handbrake button, I spin and lose all momentum.
Don't know if pro settings could fix it or not but seems like the ai drivers turn and grip much better then me, no matter what I do.
Got so tired of that, that the future mx events will be done in the lowest difficulty setting so I can just quickly move on to something better.
Maybe I'm just too spoiled by GTAV's physics.