I guess you switched to continental or at least half grip for this stroke or you are still using semi-western grip for the bh?Its been covered here before but I made a vid. Thought some would enjoy.
This is like the Wegner stuff I think. What I am showing might not be what is going on during hitting. Anyhow I am not saying that its a goal, but its like the BH equivalent of the buggywhip fh: