It gets even better...

Did you say 100 ASA? It's a 6x6 negative? This is quite close to the grain that I get with Tri-X beyond 800 ASA, but in 35mm, not 6x6. You used Rollei RLS? That is not even a "push" developer, you even lose film speed with RLS, and I never heard that it causes excessive grain.
Just to compare, this is good old Tri-X @1600 in XTol 1:1 and it even gets along with the high contrast in this scene:
So, at first glance this film is obviously a clear choice for people who really, really want an extremely coarse grain even in 120 size and a very strange "ortho" tonality. If I were shopping for a film that creates results as they are displayed here I would look for some chinese "Lucky" film, put a blue filter on the lens and push it in almost undiluted Rodinal.
So, where is the slightest similarity with the quality of an APX 100? This seems to be a very special film for special purposes - and I can't even figure out what purpose might require such a film.