You really need to get to the root cause of the problem. As to a better fan, I mentioned before about the Custom 8 (356) fan; I don't know if they fit the hub (think so) and have enough clearance at the sides (356 radiator is larger), but they have 5 blades and move a bit more air. Won't be easy to find one though, but occasionally I've seen them on eBay.
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