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[RoGrrr]

I set out on a trip of about 150 miles each way yesterday with the aux tank containing about 25 gallons of oil and 10 gallons of fuel oil. I diluted the RMO with fuel oil bcuz that is what someone gave me when he changed his furnace to a heat pump. He gave me the contents just for hauling it away.
I went about 50 miles and noticed that the EGT was declining from its normal 800-1000 down to around 400 and the engine started running rough. I stopped and changed the valve back to diesel fuel. Ran normal, with EGT back up around 800-1000. I had also been watching the temps climb to around 1200+ on a long pull up hills.
Maybe 25 miles down the road I stopped and changed back to RMO. Things seemed normal, I arrived in the city and drove around a while, making a couple stops. I got back on the hiway and continued my trip and arrived at my destination without any incident. Spent several hours there, allowing the rig to cool down and started on my way again.
I was pulling a flat bed trailer weighing about 1800 pounds and on the return trip I had it loaded with 8 IBCs, each weighing about 100 Lbs and a 150 Lb shelf. Not much weight overall but a fair amount of wind loading. I limited my speed to 60.
The EGT started to decline so I had to switch back to diesel fuel. After a few miles, I was curious and changed back to RMO. All seemed well for about 15 miles and it was losing power, EGT declining and running rough so instead of switching back, I stopped and allowed the engine to idle for a couple minutes and took off again. All seemed normal.
20 miles or so down the road and it happened again so I parked onemore time but it didn’t return to normal. The EGT didn’t climb back up to where it should have been so I had to change back to diesel.
I’m wondering if the fuel pump might be weak so I’ve ordered a digital gauge to install between the pump and engine. I’ve heard the fuel pressure should be around 60 PSI. Correct me if I’m wrong.
I don’t believe I have clogged injectors or the engine would not run normally on DF after it started losing power on RMO. So cross clogged injectors off the list of possibilities.
I also have noticed that my boost has been kinda lethargic. It has been running below 5, tho I can run it up if I get on it, especially going up a hill. But I can hear the turbo whine like it always has, especially with those 5 inch open stacks and the rear window open.

Does anyone have any thoughts on why this is happening ?