Upgradeing the radiators seems pretty pointless. I dount your coolant is more then a few degrees above ambient unless you have some seriously weak fans. Even then you'd still be scapeing the bottom of the barrel . . .
Flow would be a better place to look. Bigger pump, or less restrictive loop (rads in parallel for instance). Maybe wait for pH's storm review and see what a big pump can do with a block like that before you make up your mind.
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