Egt last 2 haul days running hot

[Darmochidlogging]

I have a isx 15 in my 2013 log truck.
Last couple days been having high exhaust temps 1250-1350”f while at -20 to-30 Celsius
Trucks deleted. 650hp 35 000km on rebuild, new injectors all 6,new ecm wire harnesses, egr is all gone I ran a pipe from water pump to back of block, thought it was exhaust issue so straight piped it today, did not help befor I usually ran 900-1000 max,
Trucks pulling 75000 kg