HillBillyny2 , there is really no reason to use 3 fingers on the A ,, your ring finger should cover all 3 strings , as they would on the bar chords and use your middle and index finger as well ,,,,, example , try this , do a simple Bo Diddly beat , E chord to an A chord ( A Chord i finger , your ring finger ) then A Chord ( index and middle finger ) to a D chord ,,,, pratice that and you will soon forget the 3 finger A chord