A few thoughts - First thing I would check and always keep an eye on with a hemi is oil pressure in shutdown. Especially if you are not able to get the car into a neutral state. Wear on the bottom bearing is almost always lack of oil in shutdown because decel is where it sees most of its load. It might be better to configure your accumulator for shutdown. Make sure you have the right micron filter for heavy oil. 50 wt oil is a little thin for the summer months in my opinion. Especially if you are rich. Could be as simple as diluted oil. Especially if making multiple runs on the same batch. If the crank was recently turned down .010, was it checked for straightness after you got that one journal hot?