I have never done this but you might consider having the radiator flow tested. It might be gunked up even after flushing. The lower position of the fan would not be enough to cause significant problems, especially at 60 degree temp. Mine idled all day at that temp without boiling over. Granted the shroud is a better way to go but does not come into play at these temps. I think something else is getting in your way first. Do you see the water swirling in the radiator when the thermostat opens up?
