From
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website
"Add more surface area. If none of the other tips can get your engine cooled enough, you probably have to add a bigger radiator. No matter what a radiator is made from - copper, brass, aluminum, steel, lead - the more surface area, the better. Of course, each type of material has its own advantages and disadvantages and you will have to figure out what suits your requirements best."
It might be best to call a real radiator shop and talk to them about your use and the blockage from the winch, lights, low speed use, etc. and get their opinion. A standard Jeep radiator replacement is probably not the answer.
The web site sited has an augument about how many tubes, of a given size, will fit into a specific area. This would be true IF the radiators were the same thickness but they are NOT. 1 cores are thinner than 2 cores that are thinner than 3 cores that are thinner than 4 cores, etc.
I am not saying that you should add cores till you touch the fan but, in general, the more cores the more surface area the more cooling ability.