Whether you like the performance of this wad or not will be determined by your reloader and how it is set up. If your wad ram or shot drop tube is set to compress the wad, the wad will compress, but not spring back. That will cause problems.
Since you are reloading STS hulls, why not just use DRM's Fig-8 or Windjammer clone. Both are absolutely superb in STS hulls and there are NO fit problems. They both pattern beautifully.