Heya bud
imho, dual rads are a terrible idea. They are both looking to dissipate heat, but when connected, if you feel the desire to move rapidly or it's a very hot day, the heat in the rad will affect the condensers ability to be effective, thus you would lose cooling ability.
I guess it's like putting you home fridge in front of the radiator, if the fridge can;t shift the heat, the gasses can't re condense and the fridge loses it's ability to be effective.
I think it would more be a limit to the age of the technology of the aircon, pressures used today are greater and condensers are far more efficient.
I say delete the aircon, get a bigger rad and just drive faster with all the windows down! haha!
I say when my MB6 VTIs still has it's full aircon :P