The best you can get isn't going to happen with the best time you can get. You showed that on the previous page. Using the released version, not SR1, In a room with lower settings, the splotches overwhelm the render, and its just not usable. We have pages of tweak experiments showing that you can only get rid of them with very specialized render settings.

Your comment, "It looks really bad but I think that has more to do with light and prop placement than settings.  This one took 18 mins 13 sec." is not correct. It has everything to do with the initial implementation being very difficult to use, whereas I'm finding no problem doing room/box type renders with the same settings over and over, regardless of light placement or prop placement.

There is some artistry/technique to getting the shaders right, but it isn't hard. The important thing to understand, and I demonstrated it above with the vilters box, is that shaders participate in lighting, so you can't do stuff that is mathematically unsound, like having Diffuse_Value be 1 or having Reflection participate in the diffuse calculation.
 

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)