reduce smearing by not using IDL irradiance caching and increasing IDL samples, e.g. to 4096.  renders may be a tad slow with those.  do not use AO. enable GC (2.2). reduce IDL intensity to <=0.8 to avoid light multiplication.  FFrender calculates ray-traced shadows from diffuse light sources (i.e. posersurfaces with ambient 7) with reasonable fall-off, hence user need do little but watch it do its magic.