I had a PDR HX40 for about 6 months. I had to really baby it to avoid barking. It finally broke the shaft. I really can't say it helped the EGTs, but it could be because I was so focused on the barking issue.
I have considered changing the 370 Marine injectors. I can handle the smoke, but would appreciate the lower EGTs if different injectors would do that.
I definitely have to pay attention to EGTs, especially when pulling a long hill. I have lots of power that is not usable due to the EGTs. I have had this setup for over 150,000 miles, and several years. At one time, my truck was my primary hobby, and it got lots of attention. I have pretty much neglected it for over five years. I am slowly getting back into it.
Thanks for the input.