cummins ism running hot

Hi, I have a sterling with ism 370, it runs hot 200-225 almost none stop while driving, it also takes a very long time to cool off once i stop, but cools very fast if moving, but i have to let off the throttle, any hill it's at 225 within 1-2 min and fan kicks on for a little turns off temp drops a few degrees and fan kicks back on...... if I start the truck it warms up to 180-190 and stays there, once I start moving and I'm loaded the temp jumps up very fast, I replaced the head gasket, pump, thermostat, radiator, hoses. nothing helped so far, it doesn't take coolant at all and there is NO mixing of oil and coolant, I even removed the thermostat and hooked up a fan over ride switch, so at this point I ride with the fan one almost all the time just to keep it at around 200, if I'm going down hill and get off the throttle completely it cools down to 175 with 1-2 min. I have no idea what to do at this point, any advice is greatly appreciated, thank you.

 

I steamed/power washes the a/c cond & intercooler when I changed out the radiator a week ago, it's clean & clear you can see thru all of them.

 

new pump

 

clutch was also replaced along with belt, nothing else runs off the fan drive, I don't think it slipping since it's the only thinking keeping the truck at about 200. Could the air to air be clogged internally, the truck had a bad turbo at the time i purchased it and oil was on both ends of the air to air...

 

No smoke but I do smell some fuel out the exhaust & the rig feels weak....I changed both sensors, ecm temp sensor and gauge sensor as well.