Since you are still leaking some oil, but not as much as before, is it possible that the HPOP was replaced, but not the o-rings where the oil lines from the HPOP attach to the oil rail. Those o-rings frequently leak also. You can get those o-rings from here. Ford 7.3 Diesel Engine O-rings and Plug Gaskets
Get the Forscan here. Download FORScan
You will need the OBD adapter also. The link for that is on the Forscan website link above.
See if you get any codes with that, and post them here so that we can help you with the diagnosis.
Copy that, I'll get it scanned and let y'all know. I replaced the HPOP myself, and the o-rings are intact.