Hi,
Virtually anytime the Car won't track straight on a good flat road it's an alignment issue. But, that can be caused by many things from incorrect alignment, worn bushings, bent suspension member, worn tires, bad tie rods, etc.
In your case, I suspect replacing only 1 tire on that axle is a significant part of the problem. Also, the tire could be out-of-spec (even though new) compounding the issue. What's the difference in mileage or tread depth between both front tires? Even a little and the car essentially leans a little to one side - it doesn't take much.
You should not swap a uni-directional tire for two reasons. First, the tire is designed to channel water away from the car in the wet. Switching it to the other side causes the tire to throw the water under the car and under the other tire instead of away from it. Also, the tire will run hotter as well.
Have the Tires Road Balanced, meaning a Hunter 97XX machine and be sure to use an alignment specialist, not Firestone, Tires Plus, or the like. This is one area where paying more usually means getting more. Keep us posted...
Happy Motoring!... Jim'99
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