Mark, the profile starts paralell basically, then pyramid. But its all blurred and rounded some by handtools. I make these 32-34mm wide.
Arvin, I have not worked gemsbock. People say it is a little less dense than buffalo horn but basically similar properties. Very strange for your bow to take set! I could imagine if the Horn is very very thin, the wood beyond getting out of shape and taking set. But that is really strange. Maybe its not enough horn so the wooden aspects overrules the little horn. But they say 1mm of horn over maple is enough to make a 50# hornbow! I cannot help really.