High turning torque creating an overheat condition would have let you know already, it would have wiped the bearings and started knocking. I hate to say it, but I would go back through the cooling system and list every part. Any other signs it is hot other than the gauge?
I’m not sure what I could possibly do. That’s any different except go back to stock which I’m not willing to do at this point. It would cost too much money. I’m just trying to work with what I have, but I appreciate any advice.