Ok, your water temps are high.
When I first put an aftermarket bumper on my van we had some overheating issues, seems the bumper was blocking airflow to the bottom 1/3 of the radiator. Diesel vans are marginal for cooling capacity at best and some aftermarket bumpers make it worse.
On mine, I was able to see the problem, the radiator had normal bug debris except the bottom 1/3 was clear of bugs. No airflow = no bugs. I had to make a bunch of 2" holes in the bumper to restore airflow.
Could you have similar issues? Some SMBs with Aluminess bumpers have added air scoops below the bumper to add airflow.
Mike