Most 6.4 PSD I see running around here are deleted and for good reason. The first generation DPF equipped trucks are pretty brutal on fuel and dilute the oil with diesel fuel. End result will be rocker arm failure at a minimum.
As a side note I remember stopping by the shop where my cousin works to visit during hunting season and I could almost guarantee I would find a 6.4 PSD in a black box waiting to be picked up as a core replacement.
A friend of mine has a '10 6.4 PSD and he deleted his after he got tired of his fuel bill, and his previous truck was a V10 Super Duty.
For comparison my 6.7 PSD when pulling the camper will go about 500-750 miles before performing an active regen and will take 10 miles to complete.
I believe Ford made improvements to the regen strategy to tame it a bit after they ditched this engine so you may want to check into seeing upgrading your flash.
