That is the downside to forced induction, the heat produced especially water cooled turbos, it was done to make then warm up quicker, but it makes cooling a nightmare due to the heat absorbed be cooling it, TBH IMO I think turbo coolers are a bit of a gimmick, the same as TT'S are never tried either though.

I don't see what benefit you would have by swapping the rads over unless your one is sludged up or needs recoreing etc albeit it is a nice Pro alloy one.

Martin