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I am by no means a pro but sounds like a few issues. Your not driving the truck anymore I would hope. If your heads havent gone yet I imagine with the egr leaking its only a matter of time.
I think if your LPOP goes out then your HPOP isnt going to get the required oil to use to build pressure. However I think there is a code and possibly engine cutout associated with the LPOP not working properly. From what I understand (have not done it yet) but the air test can be kind of tricky to identify any oil leaks.
I would get some sort of gauge setup like a edge CS to monitor all the parameters (there are lots of others also). This will help alot in diagnosing issues.
Skip on the high flow oil cooler. I have one and deltas are normally what you would consider a stock one to have when its clogging up. They dont cool as efficiently. I dont have a problem with mine but when it goes I am going back to OEM cooler. Also stay away from the dorman coolers.
Thats just a start. Hopefully others will add more stuff.
2003 F350 Lariat 6.0L
MTW stage 1, 4" MBRP, IPR coolant filter, 05 front cover and water pump, everything else pretty much stock.