I wish I had a better understanding of what GDE did with their cals and the CP-4 pump, what they discussed is over my head. It does make me wonder why RAM didn't do this to help protect the HPFP.
About a year ago I took delivery of a new RAM 1500 ECODiesel, with about 1,200 miles on the odo, I drove over to GDE and had their engine and transmission calibration installed. It was a remarkable and highly noticeable result. The entire behavior of the powertrain was noticeable and for the better, much better. I also experienced an increase in MPG albeit with a new engine, I'm not sure what the exact results would be with and without GDE's calibrations. I get an average of 32.6 MPG on summer blend diesel.
My ECODiesel was not part of the CP4 recall, my build date was just outside the recall cutoff date. I don't know what changed between HPFPs in production. There doesn't seem to be any clear answers on what RAM is doing or what they are replacing some of the CP4s with.
In my ECODiesel, the 2015 Cummins (CP3), tractor, mower, and RTV, I run Hot Shot's Everyday Diesel Treatment to improve the lubricity of the fuel.