Have you changed the plugs to a step colder with a smaller gap? I'm not familiar with what the Mopar is running facotry, but I imagine the plug is a cheaper style like the LS1 with a Platinum disc, those tend to blow off the grounding strap under extreme cylinder pressure, and the factory gap is probably a bit wide for nitrous use. The LS1 has a .050" gap or something, and we tighten them down to around .038" or less, using NGK TR-6 Plugs. Also, buy a filter and a bottle warmer. The little screen in the inlet of the nitrous will clog us easily, from either having trash in the new bottle, or when you fill it from the supplier which will cause it to run shitty. GL.
Charlie