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Does your controller not act as a full H-bridge?
A series-wound motor (most common type of that size), cannot be reversed by reversing the polarity of the ends of a pair of series-connected coils. It will spin in the same direction both times.

If you don't have 4 terminals, you have to do some surgery, cut between the two coils and bring out each of their respective endpoints so that you can reverse one coil relative to the other.
 
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