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I don't think there would be a difference between the SD and SDL radiator. I would still encourage you to try hosing out the outside of the radiator.
Might seem counterintuitive, but I would also go back to the stock thermostat. If you go low, the possiblity is that the coolant might not be staying in the radiator long enough. I think the stock one is 80C. How's the coolant look? Also have you checked the pressure cap?
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