CTS-V Tune, looking for feedback and help

So trying to build myself a nice little A-Class CTS-V Coupe and realizing I’m a little rusty at tuning (Haven’t been around much since FM2). For the most part the car is handling the way I want it to for my driving style aside from a little turn entry understeer in quick corners. It’s not horrible but I’ve tried tweaking mostly every thing I can think of that could solve the problem without getting it out completely and figure before I start making larger changes because I’m that guy I’d post up the build/tune here to hopefully get a little input from those around here that are less rusty (maybe better is the more appropriate word but again…that guy ) than I am so:

BUILD:
Race Exhaust
Race Platform and Handling except stock Chassis Reinforcement and Roll Cage
Sport Driveline & Race Diff
Sport Tires, 265/40R19 front/325/30R19 rear tires on Gram Lights 57 Optimise rims
Race Forza Aero

TUNE:
Tire Pressures: 28/28
Alignment: -1.6/-1.2/0.0/0.0/5.8
Roll Bars: 17.00/16.00
Springs: 655.0/515.1/5.1/5.2
Damping: 8.4/8.0/1.8/2.0
Aero: 100/200
Braking: 52/124
Differential: 54/24

Of course there’s always that chance that the car is really bad anyway and my driving just can’t see that so I’m pretty much open to any changes that can improve the car be it tune, build or a combination of the 2 hopefully with some good drivers and tuners this can become something halfway decent