I understand your concern about possibly overworking and shortening the life of the stock in the tank lift pump when adding additional filtering.
I installed this fuel filter kit
https://www.dieselfuelfilterkits.com/2013-2018-cummins in June 2020.
I have been running with stock filters and the additional 2-micron NanoNet Fleet Guard FF5814 filter.
No problems with my pump yet, but I am also concerned.
I have checked the pump current with all three filters, and the average amperage is 5.7 amps (See attached).
I will check the current with stock filters to compare the difference and report back.
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