CM2250 HIGH coolant and oil Temps

[Paradoc23]

Hello,
I bought my truck a year and half ago and have been fighting high coolant and oil temps
Truck was De-Mandated when I bought it so I have no idea who did it as well as the quality.
Everything I have read I think it was an "OK" job just based on oil staying clean for 6,500+ miles.
Since buying the truck I have replaced termostat, had radiator and cAc cleaned out, kept air,fuel,oil filters all replaced regular and dont go more than 250-300hr or 10,000miles on services. After talking with my mechanic it seems maybe the file is "HOT" and causing my temp issues. Normal driving conditions empty (33,000lbs) coolant will go from 180 to 210 from a stop to highway speeds and oil temps I have seen as high as 252 degrees on hard pulls. I kick my fan on at 190 just to get a head start on tryin to keep it cool. Both coolant and oil seem to be boost related and am fully aware of the vgt turbo, but driving in the mid west with mountains I dont want to loose my Jake brakes. I have talked to a few different tuners and all have said that they can not look at my file just replace it for $2000.00. Dont want to spend that much if the file I have is fine. Is there anyone that can look at it remotely? I can get the equipment I need to do that if so. Or any other info would be awsome. This is my only truck and my only way of making money. Im not trying to make the biggest hp on the road I just want what I have to last.