Peterbilt 2015 cm2350 list of issues

[Trey7981]

I do heavy haul and my truck seems to have lost power. No codes active I have a live data scanner not insite. Just did the egr tune up minus pulling the cooler off. Replaced imap, both exhaust pressure sensors, ambient air pressure sensor, and egr delta p. Empty with just my trailer 53k lbs gross I’m having to downshift to 7H on small hills. Loaded at 130k pounds it 20-25mph and a steady 38psi boost on small hills. Get to 65mph is almost impossible loaded. Factory everything 550/2050 tune. Might be my imagination but seems my engine fan comes on a lot also. A/c’s are off and water at 180 oil at 202 and the fan keeps cycling. Aftertreatment is reading .68psi back pressure with a .04 differential. Filters cleaned 2 months ago “just for reg maintained”. I pulled apart the exhaust system one section at a time to see if any blockage issue exists. Cummins tested my fuel pump said it was performing well. No oil consumption. I do lose a little coolant but there has always been a small leak at the coolant filer seal and the leak amount is about 2 gallons a year. 18speed 4.11gears. Any perspective would help thanks in advance