I know beta 6 is coming soon, but if you are riding in beta 5b, and are having problems with the front getting of the ground all the time - set the engine mapping to wet (on the bikes that have that option). You lose some power but the bike becomes much more rideable...
Cheers,
David "Gonzo" Boda #46
Depending the track i use 2 or 3 mapping during a lap