For what it is worth, I generally use the following radiosity settings, 
to full satisfaction:

     pretrace_start     0.08
     pretrace_end       0.004
       count            100, 1000
       nearest_count    10, 5
       error_bound      1
       recursion_limit  2
       low_error_factor 0.3
       gray_threshold   0.0
       minimum_reuse    0.015
       maximum_reuse    0.1		
       brightness       1

       adc_bailout      0.01/2
       normal           on
       media            off
       always_sample    off

This is quite fast and I experience little or no artefacts. Note the 
dual (optional) parameters used for count and nearest_count. This can 
increase the quality of your render without slowing it down much. See 
the following page of the wiki: 
https://wiki.povray.org/content/Reference:Radiosity#count

You may also want to try stochastic rendering with, e.g., +am3 +a0.01 
+ac0.90 +r3. If you do that, change count to 10 all other radiosity 
settings remaining the same.

-- 
Thomas

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