Steps 6 and 7 remove look angle errors based on different geometric assumptions.
The reduction of points is done in earlier steps (amplitude dispersion in mt_prep, maximum
fraction of random phase pixels in step 3, weeding in step 4).
The variables are explained here: StaMPS/2-4_StaMPS-steps.md · master · Matthias Schlögl / gis-blog · GitLab
I’m afraid you have to go some steps back to reduce the data volume.