[Johnny9ball]

Turn it down 550% is a huge #. Turn Ambient down to 5% or even turn it off. Haveing Ambient at 25% and white is adding way to much light to Radiocity. You can also check your hdir map and turn that down also. Try lower values when rendering. Remember Radiocity calculates bounced light off of surfaces so light can stack off eachother (from bounces) and get all blown out white on surfaces. Check the diffusion on your surfaces and try to turn it down 20% or so this will absorb some of the light hitting it.