I don't know the underlying mechanics of how radiosity works, but I'm 
guessing your extra, bouncing rays require more samples in your 
reflection/transparency/area lights scene.  A few suggestions for your 
parameters:

error_bound seems quite low.  Try increasing it to 0.5 or 0.8.  Your 
lighting will be less accurate but you will get smoother, faster 
results, and since you are already using regular light sources, the 
accuracy shouldn't be an issue.

recursion_limit, try dropping that to two.  You'll save some time on the 
rendering and your scene may not require the third bounce since you are 
using regular light sources and the contrast isn't that high.

count, keep increasing it if you are still getting artifacts.  Try going 
all the way to 1600.  This is why I suggested a higher error_bound and 
lower recursion_limit, so that increasing the count wouldn't kill your 
render time (too much).

always_sample, turning this off may eliminate some blotchiness.  Make 
sure you aren't rendering a saved rad file from your reflectionless pass 
too.

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