You thinking added cooling without the fan, but with the cooler? Or remove the cooler altogether?
I'm with a previous post, if the cooler itself is not in the way, I'd say a little extra surface area for heat displacement couldn't hurt...Keep in mind (as you WELL know!:redneck, these LS motors run a factory external oil cooler...
For what it's worth. I don't know anyone i wheel with who has an oil cooler. So taking the fan off would be a great way to simplify things and still be more than adequate.
I would keep it if possible. Could you run the fan off the same switch as the radiator fan? That way it shouldn't be on all the time and if the water is hot the oil in theory would be also.