I dont know if you have given this a try yet but it might help to add a little lubrication. Lucky Tiger Brushless Shaving Cream 16 oz

Have you tried using aloe as an aftershave treatment from what I understand it does have some healing properties.

I know African Americans generally have a lot of problems with bumps due to the curliness of their hair. I attend barber college in Detroit and many of my peers have problems shaving because of this, for a few it is so bad that they can only use clippers on their facial hair. Its one of those unfortunate things but some people just cant shave.