TDubya,
Trust me, the Sullivan tailwheel has plenty to steer the plane on the ground. The reason you don't see the wheel moving much in front of you is because it's sitting on the ground and not moving. Once the plane is in motion it will be more than enough to steer the plane. I have used Sullivan tailwheels on planes from 2 pounds all the way up to an 18 pound bird and have never had any problems. In fact, this is the only type of tailwheel that I use. You'll be fine with this setup

Hope this helps

Ken