How much should I receive, 30%, 33 1/3% or 40%?

Demand to know from him why he gave you so little. Did he use most of the settlement to pay all the medical bills so there was little left? What are the exact terms of your contract with him as to division of any settlement amounts. Normally, the attorney collects only a percentage of funds as received. If he can not satisfy you with his answers, start looking for another attorney and fire the old one once you have found a replacement. Go to the State Bar to make a complaint.