I drove your car at autumn ring, mt. panorama, and nurburgring GP/F. I didn't experience much shaking/chattering at autumn ring except for just a split second so that's why i took it to two of the tracks that can really mess up the balance of a stiff car.
Before I get into the results I wanted to say that for a beginner tuner you seem to be on the right track. I'm going to assume that it's not a complete tune and is still a WIP. Your car I think would best be described as "safe", which isn't a bad thing at all. You take an oversteery and drifty car and gave it an amazing amount of rear grip. It is easy to drive and very predictable. It's actually too safe for my taste but take that with a grain of salt because all of this is just my opinion and you most likely arent done with the car.
At panorama there was plenty of the shaking, as we'll call it, to be seen. It never once upset the car though. there was never the plowing that comes from bottoming out or the chattering that comes from hopping because of a stiff suspension. There was a tiny bit of understeer that comes from having the front stiffer than the rear, but when it got bumpy it never altered the driving line.
At the gp/f, turn 6 can make your car look like it has hydraulics on it and you are hittin' switches. Also the up hill chicane (turns 8 & 9 i think) can upset a car that is too stiff. In turn 6 there was plenty of body motion but again the tires were always in contact with the pavement and there was no plowing or understeer. You can tell because there may be a lot of tire squeal and noise while turning, but if the car is too stiff it turns into chirping/chattering instead of a constant sound. In the uphill chicane I wasn't going fast enough to get the car to exhibit any type of weird behavior either.
After making changes to ride height, spring stiffness, and damping, I would really just chalk up the shaking to the suspension doing what it's supposed to do. Despite a lot of body movement, there were none of the typical signs of being too stiff. There's no sudden untersteer or loss of tire contact.
If youd like, I can build one and post the setup so you can get a different feel for how the car behaves with different styles of tuning. Maybe @
DolHaus @
Thorin Cain @
Jump_Ace can do one too if they have the time and post it here. One of the things I did while learning was take a tune that I really liked and deconstructed it to see how the tuner got the car to that point. I learned a lot that way.
*edit* i had to add flat floors to get the same stats as you, im assuming you have that equiped as well ?