The minrad was decreased even further to 0.01. but I see no change compared to the rendering in the previous post.

Minrad = 0.01
Maxrad = 50

Finalgather rays = 1000

edit:
I wonder what is concidered a decent setting, so that one can simply beef up the number of finalgather rays. Finding an optimal time saving solution, with the radius setting, is quite important I guess.

Next I'll set min rad to a really good number 0.01, which is ten times smaller than the decent number of 0.1 (10% of maxrad), with maxrad at 1 (about 10% of my scene size in "maya units")
Im not completly sure what a maya unit is, but I recon it is meters in my project. The model of mine is about 20-30 meters wide out to the edges, but the "main" model is only about 10 meters wide, so I'll set the maxrad to 1 next.

I'll decrease the maxrad to a number where I cannot see any improvement, and then increase the final gather ray count from 1000 and upwards .