You been spying on me? lol. I am already looking for a new rear end. Also looking for engine internals , cams , pistons, intake mods etc...At some point the one legger 198mm is going to either break or be really really really holding you back in terms of hook, in general spider gears blow up when spun with ample HP.
As a suggestion, you may look into the 236mm R/T m6 (also 2010 up SRT8) rear with LSD, or at the very least the 216mm found on all hemi, and an option on the 2011 V6, there are aftermarket gears (3.92) and LSD for this one. I would assume you would need the whole setup( drive shart, half shafts, center diff, hubs and bearings) so a wrecking yard would be helpful. These are stock parts with little demand, I think if you low balled them you would move it! If you were local I would help...