Andrii Shramko demos a useful feature in RE:Lens spherical stabilizer allowing you to handle real hard shots by masking areas of the source. You can also use this feature on fisheye stabilization where there is moving junk (light flares and leaks) outside of the image circle that affects the tracking, as well as in stitched videos where a camera is moving indepedently from the rest of the rig (which confuses any tracker).
https://www.facebook.com/shramko360/