Not enough rudder authority during takeoff roll
...and then I'm always on the grass instead of on the runway. Anybody knows why this could be? Normally I would say yaw damper but I must have missed something else.. not using FSUIPC axis mappings, just default.
The rudder authority is correct. The Vulcan used nosewheel steering until the rudder becomes effective around the 90kt (from memory) mark which is why you will see the elevons down (stick forward) if you watch take-off videos of the aircraft. Unfortunately, FS has a rubbish ground friction model and you tend to lose NWS too early.
Line up properly, respect crosswind limits, lead with either left or right throttles and occasional left or right brake are about the only advice I can give on that, sorry.