The shimming you're describing is definitely not the way to go. A better place to shim, as unapomer pointed out, is between the bb cup and the frame. You can get spacers meant for this area, also there are certain spacers from other components that will work. Not sure a 1" headset spacer would fit, but if all else fails you can get a spacer from your lbs for under a buck. I used a freewheel spacer for mine- worked well.