I've had a much easier life following a super easy rule for highways:
Left lane: Passing/Fast
Middle lane: Cruising
Right lane: Exit/Slow
If I'm in the left lane doing 110 MPH and there's a pickup truck right on my ass, I'll signal and go middle lane and just cruise for a bit.
9 times out of 10, I'll see that exact same pickup or other car on the right shoulder with a state trooper writing him up.
It's happened so often in my life, it's made me believe in "instant karma". Just let them pass.