By strum do you mean pick? If strumming, the chords thumb and finger are fine. If your picking with just your thumb and index finger than that would explain your problems. Try using your third finger for the top string ,second for the second string and index for the 3rd string. You can just rest your fingers on each string as a guide to where they are. Makes it a lot easier to pick smoothly without so much hunt and pick and should let you focus more on your left hand changes.
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