Penny,
You were possibly fast on final, because your ROD on base was not appropriate for the wind conditions. With the 'tailwind' on base, I'll bet you were high on final and pushed the nose down to regain your profile, leaving you fast.
When you flew the base turn with the 'headwind' on base, you arrived at the start of final on the correct slope, and were able to fly final at the appropriate speed. If you don't check you finals 'window' you may not have perceived the aspect.