Do keep in mind the SPH Bearing is designed to have a Thermoplastic/Metal Interface, where Thermoplastic is the Sacrificial Material.
This as a basic function is not enabling a Metal/Metal contact during rotations, as is happening in a Bearing utilising Metal components as the Sacrificial Parts.
A TT in use with a non metal/metal contact within the bearing housing will be noticeably different in how much quieter the operation is perceived to be when in use.
I know individuals who have modified a Bearing using Thermoplastics and have a Original Bearing assembly at hand. The same TT > TA > Cart's has been used with the differing Bearing Assemblies, with the result being, the original bearing assembly was as good as discarded from being used.
Food for Thought, I encouraged the individual who carried out the above to rigidly secure the base of the preferred bearing assembly. The follow up reports were as good as WOW!!, what just happened.