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Hey Boke just a thought i used to run the original aluminium radiator and i filled it with mud one day out the bush and i thought i cleaned it all out but i obviously didn't do a good enough job and the next time i took it out it over heated to around 3/4 and a crapped myself i pulled over and it cooled down straight away. Anyway i cracked the top tank so i had to get a new one and i was advised to stay away from the copper radiators as they don't disperse the heat properly so i put an aluminium one in which was 30% bigger than the standard radiator and i have never had a problem since. Maybe a possible solution to your problem. I just got one of those radiators on ebay for like $380 and has been in there for 2 years so far and still havent had any issues. The ebay seller was called radiator warehouse and are located in Queensland i think from memory. i hope you sort your problem out