I use -3 -1 too, but 80 still gave me blotches. I can try your settings just to see, but I think hsph 80 is not enough for this scene. Also won’t interp samples 30 smooth the details too much? I don’t like increasing it. Maybe I should leave hsph 110 and change clr, nrm, dst thresholds? though I’m not good with those.
Here is what hsph 110 looks like. The left dark wall with plants is still not perfect, but ok.
