Poor tracking quality

[rosshemsley]

Using out-of-the box settings gives me very poor tracking with MYNT S (the pose is unstable and quickly diverges to infinity with the slightest movement).

I was only able to achieve tracking by increasing the noise parameters by about a factor of 10X:

https://github.com/slightech/MYNT-EYE-VINS-FUSION-Samples/blob/docker_feat/config/mynteye/mynteye_stereo_imu_config.yaml#L61.L66

Could this be a simple config bug? Or are there other things worth tuning?