With only 14k psi RP at WOT, the truck has major power loss at WOT and top end.
When you get it fixed correctly, you will see the difference.
If the tube retorque does not solve the problems, you've got major work to do.
Were the connector tubes new? If not were they examined closely under magnification for any pressure etching from tip leaks, tip fractures or interior/exterior rust flaking off. Rusty connector tubes kill new injectors from stuck open inj. return valves with a rust chunk in them to new nozzle pintles scratched/etched or blocked open by a rust chunk. Rust chunks also plug nozzle holes.
Leaking tube tips just make your life miserable, often one cannot see the micro cracks even under 100 mag., they only show up under high pressure, think 15k psi.
Start with measuring the lift pump output pressure under WOT. If negative find the problem restriction or LP is titts up.
Then check each injector's return flow reduction by blocking off injectors 1 at a time. You picked a brand of rebuilts that have leaker problems.
Any fuel in oil, or strong white smoke on cold startup or strong black smoke on WOT? Leaker nozzle/s or a leaking CP3 HP pump seal into the crankcase via the front gear case.
Good luck, hope you have lots of hair, some of it's going to come out unless your are lucky.