Like Widewing says, 200 is too fast and also most planes in the AH set won't do a pure hammerhead. With the Hurri, wait until you decelerate below 100-80 mph using a bit of forward stick to keep the nose straight up (don't let it fall over on it's back). Keeping the stick forward move it to the right to counteract left roll as you hit left rudder. It'll typically roll left in any case but the left aileron will help you to minimize it. Be ready to zero out the yaw as you come around. It's hard to do consistently