What do you consider "low speed"? Most bikes will not be stable with no hands at low speeds. Depending on the amount of trail, wheel flop can be pretty significant at low speed. Crowned roads will also cause your bike to veer toward the shoulder of the road unless you lean toward the center of the road to correct it. You don't say what kind of bike this is, but I'm assuming its a road bike because of the carbon fork. I doubt that any decent carbon fork made it past QC with a significant misalignment. I suspect that, if there is a problem, it is one of the suggestions above.(cable causing the wheel to turn to one side or headset problem)