I think the lift pump is also a partial band aid to a larger problem
I bet your CP3 is worn out
What about the injector tubes or cups? Injectors ever been removed from the truck?
2012 Ford F150 FX4; Long Bed; 3.5L V6 ECO; Max Tow; 3.73; Leveled; 275/65R20 Goodyear Duratracs