I have noticed great improvement in my car's shifting in the last year, running better wheels and tires on both the street and track has made a huge difference for me. My street set up(rears) now is Hellcat reps with 305/35 Michelin PS4s and for the track I've been using 18" Bravados with 305/45 Mickey Thompson ET Street R's. I also almost always leave the car in D while in sport/track modes. I mean it's worlds better than it was, I'm actually really happy with how the car shifts now, and I think I had the hiccup as bad as anyone when I first got my car and was figuring it out...