Angular Velocity Strength is a dampener, on my own springs it’s usually about 1% of stiffness value. You have to find it experimentally, when it’s too low suspension will wobble, when it’s too high it will jump erratically or stop it’s motion very rapidly.
Try higher values for Angular Position Strength, if you can’t find such that won’t allow spring to compress at all then something is wrong with settings.
Tuning is in two steps, you set something like 1 for Angular Velocity Strength (just so that it’s not a zero) and that approximation from formula for Angular Position Strength. If suspension doesn’t hold then make Angular Position Strength 10 times bigger. When it’s too much you will see that it won’t bend at all, then return it back to previous value and make it 5 times stronger instead of 10 and etc. until you get to something that looks right clearance wise.
After this you can tune Angular Velocity Strength until tanks doesn’t wobble after landing on wheels.
Have you created and connected all OnComponentHit events already? Those need to be done before UpdateFriction otherwise you can’t test it.