Same Story DIfferent Truck

[snailexpress]

I would start from shopping your own Inline adapter and installing Insite. You can monitor the engine and post here your question. $300-400 investment will save you a lot of money.
Before yor adapter arrives check all exhaust for leaking. I have seen a lot of mechanic didn't install gaskets when they change doser injector or installed them not properly. Same about DPF can gaskets after DPF baking. Flex pipe right after doser injector downstream could have leaks as well. Did you inspect SCR and DEF pipe and doser for clogging. It will cause huge EGP and low DPF differential pressure readings. ECM will go crazy.
All info where and how you can find on this awesome forum.