People have asked for blackbox examples of how well the Kakute F4's soft-mounted gyro works. Here's an example of what the gyro looks like hard-mounted in a QQ190 frame. The raw gyro is the top trace, while the soft-filtered gyro is the bottom trace.
To recreate this trace, make sure you have "set debug=gyro" enabled in your CLI. This will cause Blackbox to log the raw gyro in addition to the filtered gyro. Then zoom the gyro trace all the way out to 10% by pressing the Z key in the Blackbox Viewer. You can compare the thickness of the gyro lines for your copter to this one and see how well the foam is doing.