Mate
do u use a adjustable thermo fan switch if not get one and set it to come on at 80 celsuis

gassa

Another thing to look at is air in and out of your radiator - how well is it sealed to the metal around it? gaps will give you less efficient cooling, same goes for a shroud if you can fit one - Also, a small `spoiler' directly under the radiator can help air recycling under the rad - have a look at how VL commodes are set up, with two small spoilers, one under rad, one a bit in front of it - actually works quite well.