I know that this topic is really old, but to people who still need help, the problem can also be the suspension.
Take these options:
<fSuspensionUpperLimit value="0.090000" />
<fSuspensionLowerLimit value="-0.140000" />
And keep these values as close to 0 as you need. This is also a good combo with the fix mentioned by @a63nt-5m1th and you should only use this one if the trick above doesn't work.