47-55.1 Having cooling issues

[AD51]

Hi to all, I haven't posted here in forever but I know there is a world of knowledge on here. I am having issues with not being able to run cool enough. I have a 51 on S10 chassis with 350 TPI motor and 700r tranny. I have the universal aluminum radiator that fits our trucks it has the 2 rows of 1 inch flumes in it. I have a puller fan on the motor with shroud and an electric fan (running all the time) on the front pushing air too. I'm running a 160 thermostat. I do have air conditioning condenser and a trans cooler mounted ahead of the radiator. I can stay in range (200-210) if I'm running down the open road but any slow down or even hills seem to make it heat up. Any help anybody can send my way would be greatly appreciated.