One other pointer I can give you is to watch where your left hand thumb is. The reason for this is if you have mal-positioning it will effect the stretch and strength of the pinky. To keep the thumb behind the second finger at all times will make it a lot easier to facilitate what you want on the guitar. There are a series of exercises in an ebook you can download for free at http://www.guitarlessonsbuffalony.com

All the best,
Joe Pinnavaia
Test Tube Rhino