Welcome Paul,
Hold the nosewheel light as long as you are able, it's better for the nosewheel, and will make steering a little easier. Might you be unintentionally be applying brakes? Focus on keeping your heels on the floor, just as takeoff, until you need to apply the brakes. Unless the runway is short for the aircraft, it is likely that you can roll out and maybe not even need brakes, so don't be too eager to apply them, just be ready.
If the airplane will taxi straight, it'll land and roll out straight. So if you're having trouble taxiing, analyze the problem then. If you have no problem taxiing straight, but a problem on the roll out, pay more attention to your use of the pedals. If you've landed well, with good directional control to touchdown, it's unlikely that a crosswind is fussing your rollout.