I'm thinking it was most likely the grip on that bow rather than the fact it was a take down. Remember, longbow grips are usually way less pronounced than recurves. When I was first introduced to a longbow I was told to really lay the whole palm of my hand into the grip. If you try and grip a LB like you do a pistol grip RC then it could be easy to get torque. Anyway, that's my take on it. Also, it could just be that your hand just didn't like that grip. Everyone's built a little different.
Did you try shooting any of those arrows we spined out of your bow?