fael,
I don't have these problems when I do shore based landings. As soon as the main gear touch down, I chop the throttle to idle, the nose gear will touch down in less than a second, and when I am in a three point attitude, I stand on the brakes (yea, I know, wrong technique, but it's a simulation). I suggest you check your aircraft.cfg file. In the [contacts] section, make sure the brakes are mapped to the left and right landing gear. The nose gear mapping should be zero. I also have the following parameters defined in the [brakes] section:
toe_brakes_scale = 0.9
differential_braking_scale = 1
hydraulic_system_scalar = 1
auto_brakes = 0
Hope this helps.