Work on landing all your freting fingers, on the Barr chord, at once. If you do it one finger at a time you will never get up to speed in quick changing progressions. You should work to make this one clean landing a part of your fingering any chord. The goal is to make all your chord changes in a single move. Try to visualize the chord forms in your mind clearly. Then start practicing how you manuver your fingers into those form. I used to practice this on my right forearm when watching tv or having a slack period at work. Finally move that muscle memory to the fretboard, and focus on landing all your finger tips at once as you change from chord to chord. That is the goal when you want to make quick changes of any chord form. No matter how good you become at "one at a time finger tip landings", you will never be as fast as if you mastered the landing all at once trick, to begin with.
Luckily, like you said, "repitition is my friend". Repitition is going to be your friend for as long as you play the instrument. As long as you keep practicing regularly... as Lisa once said on this forum... "You will get there as soon as your body is ready to be there... no sooner." Patient persistant practice pays. IMO...that is how you develop muscle memory and muscle memory is where instrumental mastery lives.
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