Ladder bars tend to add stiffness to the suspension and keep the car from rotating the front end. Maybe it's just because they also act as an anti roll bar, but I have set up multiple cars where the car seems to be less active on launch, even though it bites harder. 200 sounds about right for the weight, but if you can swing it, it's never a bad idea to experiment with +/- pressure springs. Just like playing with shock settings. No reason to stagger spring rates. If it's necessary, then something is wrong in the car or suspension. I had problems with tire spin on shifts. It ends up my tires went away. Would still launch fine, but I have videos of tire smoke on gear changes.